Finding the Third Proportional to 11,688.75 and 15,385.50

Step by Step Solution

1. Step 1: Write the proportion equation
   11,688.75 : 15,385.50 = 15,385.50 : x
2. Step 2: Convert to fraction form
   11,688.75/15,385.50 = 15,385.50/x
3. Step 3: Cross multiply
   11,688.75x = 15,385.50 × 15,385.50
4. Step 4: Simplify right side
   11,688.75x = 236,713,610.25
5. Step 5: Solve for x
   x = 236,713,610.25/11,688.75
6. Step 6: Final answer
   x = 20,251.41