Finding the Third Proportional to 399,064,369,408 and 826,415,817,531.50

Step by Step Solution

1. Step 1: Write the proportion equation
   399,064,369,408 : 826,415,817,531.50 = 826,415,817,531.50 : x
2. Step 2: Convert to fraction form
   399,064,369,408/826,415,817,531.50 = 826,415,817,531.50/x
3. Step 3: Cross multiply
   399,064,369,408x = 826,415,817,531.50 × 826,415,817,531.50
4. Step 4: Simplify right side
   399,064,369,408x = 682,963,103,466,257,500,864,512
5. Step 5: Solve for x
   x = 682,963,103,466,257,500,864,512/399,064,369,408
6. Step 6: Final answer
   x = 1,711,410,879,601.74