Finding the Third Proportional to 111,336.50 and 172,428.75

Step by Step Solution

1. Step 1: Write the proportion equation
   111,336.50 : 172,428.75 = 172,428.75 : x
2. Step 2: Convert to fraction form
   111,336.50/172,428.75 = 172,428.75/x
3. Step 3: Cross multiply
   111,336.50x = 172,428.75 × 172,428.75
4. Step 4: Simplify right side
   111,336.50x = 29,731,673,826.56
5. Step 5: Solve for x
   x = 29,731,673,826.56/111,336.50
6. Step 6: Final answer
   x = 267,043.37