Finding the Third Proportional to 429,517.31 and 631,128

Step by Step Solution

1. Step 1: Write the proportion equation
   429,517.31 : 631,128 = 631,128 : x
2. Step 2: Convert to fraction form
   429,517.31/631,128 = 631,128/x
3. Step 3: Cross multiply
   429,517.31x = 631,128 × 631,128
4. Step 4: Simplify right side
   429,517.31x = 398,322,552,384
5. Step 5: Solve for x
   x = 398,322,552,384/429,517.31
6. Step 6: Final answer
   x = 927,372.52