Finding the Third Proportional to 131,396 and 272,139

Step by Step Solution

1. Step 1: Write the proportion equation
   131,396 : 272,139 = 272,139 : x
2. Step 2: Convert to fraction form
   131,396/272,139 = 272,139/x
3. Step 3: Cross multiply
   131,396x = 272,139 × 272,139
4. Step 4: Simplify right side
   131,396x = 74,059,635,321
5. Step 5: Solve for x
   x = 74,059,635,321/131,396
6. Step 6: Final answer
   x = 563,636.91