Finding the Fourth Proportional to 11,128.52, 15,348.66 and 7,149.98

Step by Step Solution

1. Step 1: Write the proportion equation
   11,128.52 : 15,348.66 = 7,149.98 : x
2. Step 2: Convert to fraction form
   11,128.52/15,348.66 = 7,149.98/x
3. Step 3: Cross multiply
   11,128.52x = 15,348.66 × 7,149.98
4. Step 4: Simplify right side
   11,128.52x = 109,742,612.03
5. Step 5: Solve for x
   x = 109,742,612.03/11,128.52
6. Step 6: Final answer
   x = 9,861.38