Finding the Third Proportional to 76,111.31 and 172,143.56

Step by Step Solution

1. Step 1: Write the proportion equation
   76,111.31 : 172,143.56 = 172,143.56 : x
2. Step 2: Convert to fraction form
   76,111.31/172,143.56 = 172,143.56/x
3. Step 3: Cross multiply
   76,111.31x = 172,143.56 × 172,143.56
4. Step 4: Simplify right side
   76,111.31x = 29,633,406,110.19
5. Step 5: Solve for x
   x = 29,633,406,110.19/76,111.31
6. Step 6: Final answer
   x = 389,342.99