Finding the Third Proportional to 253,863 and 391,801.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,863 : 391,801.50 = 391,801.50 : x
2. Step 2: Convert to fraction form
   253,863/391,801.50 = 391,801.50/x
3. Step 3: Cross multiply
   253,863x = 391,801.50 × 391,801.50
4. Step 4: Simplify right side
   253,863x = 153,508,415,402.25
5. Step 5: Solve for x
   x = 153,508,415,402.25/253,863
6. Step 6: Final answer
   x = 604,689.99