Finding the Fourth Proportional to 12,500.78, 18,748.69 and 3,617.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,500.78 : 18,748.69 = 3,617.15 : x
2. Step 2: Convert to fraction form
   12,500.78/18,748.69 = 3,617.15/x
3. Step 3: Cross multiply
   12,500.78x = 18,748.69 × 3,617.15
4. Step 4: Simplify right side
   12,500.78x = 67,816,721.25
5. Step 5: Solve for x
   x = 67,816,721.25/12,500.78
6. Step 6: Final answer
   x = 5,425.00