Finding the Third Proportional to 81,499.50 and 172,810.13

Step by Step Solution

1. Step 1: Write the proportion equation
   81,499.50 : 172,810.13 = 172,810.13 : x
2. Step 2: Convert to fraction form
   81,499.50/172,810.13 = 172,810.13/x
3. Step 3: Cross multiply
   81,499.50x = 172,810.13 × 172,810.13
4. Step 4: Simplify right side
   81,499.50x = 29,863,339,302.52
5. Step 5: Solve for x
   x = 29,863,339,302.52/81,499.50
6. Step 6: Final answer
   x = 366,423.59