Finding the Third Proportional to 75,185.72 and 102,139.31

Step by Step Solution

1. Step 1: Write the proportion equation
   75,185.72 : 102,139.31 = 102,139.31 : x
2. Step 2: Convert to fraction form
   75,185.72/102,139.31 = 102,139.31/x
3. Step 3: Cross multiply
   75,185.72x = 102,139.31 × 102,139.31
4. Step 4: Simplify right side
   75,185.72x = 10,432,439,157.97
5. Step 5: Solve for x
   x = 10,432,439,157.97/75,185.72
6. Step 6: Final answer
   x = 138,755.60