Finding the Fourth Proportional to 11,399.28, 15,730.59 and 7,152.63

Step by Step Solution

1. Step 1: Write the proportion equation
   11,399.28 : 15,730.59 = 7,152.63 : x
2. Step 2: Convert to fraction form
   11,399.28/15,730.59 = 7,152.63/x
3. Step 3: Cross multiply
   11,399.28x = 15,730.59 × 7,152.63
4. Step 4: Simplify right side
   11,399.28x = 112,515,089.95
5. Step 5: Solve for x
   x = 112,515,089.95/11,399.28
6. Step 6: Final answer
   x = 9,870.37