Finding the Third Proportional to 415,339 and 545,371.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,339 : 545,371.50 = 545,371.50 : x
2. Step 2: Convert to fraction form
   415,339/545,371.50 = 545,371.50/x
3. Step 3: Cross multiply
   415,339x = 545,371.50 × 545,371.50
4. Step 4: Simplify right side
   415,339x = 297,430,073,012.25
5. Step 5: Solve for x
   x = 297,430,073,012.25/415,339
6. Step 6: Final answer
   x = 716,114.00