Finding the Fourth Proportional to 10,978.59, 15,149.36 and 7,443.15

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.59 : 15,149.36 = 7,443.15 : x
2. Step 2: Convert to fraction form
   10,978.59/15,149.36 = 7,443.15/x
3. Step 3: Cross multiply
   10,978.59x = 15,149.36 × 7,443.15
4. Step 4: Simplify right side
   10,978.59x = 112,758,921.67
5. Step 5: Solve for x
   x = 112,758,921.67/10,978.59
6. Step 6: Final answer
   x = 10,270.80