Finding the Fourth Proportional to 9,124.28, 12,591.24 and 5,145.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,124.28 : 12,591.24 = 5,145.32 : x
2. Step 2: Convert to fraction form
   9,124.28/12,591.24 = 5,145.32/x
3. Step 3: Cross multiply
   9,124.28x = 12,591.24 × 5,145.32
4. Step 4: Simplify right side
   9,124.28x = 64,785,959.00
5. Step 5: Solve for x
   x = 64,785,959.00/9,124.28
6. Step 6: Final answer
   x = 7,100.39