Finding the Third Proportional to 131,391 and 272,128.50

Step by Step Solution

1. Step 1: Write the proportion equation
   131,391 : 272,128.50 = 272,128.50 : x
2. Step 2: Convert to fraction form
   131,391/272,128.50 = 272,128.50/x
3. Step 3: Cross multiply
   131,391x = 272,128.50 × 272,128.50
4. Step 4: Simplify right side
   131,391x = 74,053,920,512.25
5. Step 5: Solve for x
   x = 74,053,920,512.25/131,391
6. Step 6: Final answer
   x = 563,614.86