Finding the Fourth Proportional to 13,469.46, 18,587.55 and 7,500.78

Step by Step Solution

1. Step 1: Write the proportion equation
   13,469.46 : 18,587.55 = 7,500.78 : x
2. Step 2: Convert to fraction form
   13,469.46/18,587.55 = 7,500.78/x
3. Step 3: Cross multiply
   13,469.46x = 18,587.55 × 7,500.78
4. Step 4: Simplify right side
   13,469.46x = 139,421,123.29
5. Step 5: Solve for x
   x = 139,421,123.29/13,469.46
6. Step 6: Final answer
   x = 10,350.91