Finding the Fourth Proportional to 10,128.88, 15,200.12 and 3,555.10

Step by Step Solution

1. Step 1: Write the proportion equation
   10,128.88 : 15,200.12 = 3,555.10 : x
2. Step 2: Convert to fraction form
   10,128.88/15,200.12 = 3,555.10/x
3. Step 3: Cross multiply
   10,128.88x = 15,200.12 × 3,555.10
4. Step 4: Simplify right side
   10,128.88x = 54,037,946.61
5. Step 5: Solve for x
   x = 54,037,946.61/10,128.88
6. Step 6: Final answer
   x = 5,335.04