Finding the Fourth Proportional to 9,124.12, 12,591.30 and 5,145.22

Step by Step Solution

1. Step 1: Write the proportion equation
   9,124.12 : 12,591.30 = 5,145.22 : x
2. Step 2: Convert to fraction form
   9,124.12/12,591.30 = 5,145.22/x
3. Step 3: Cross multiply
   9,124.12x = 12,591.30 × 5,145.22
4. Step 4: Simplify right side
   9,124.12x = 64,785,008.59
5. Step 5: Solve for x
   x = 64,785,008.59/9,124.12
6. Step 6: Final answer
   x = 7,100.41