Finding the Fourth Proportional to 10,978.48, 16,471.58 and 5,435.66

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.48 : 16,471.58 = 5,435.66 : x
2. Step 2: Convert to fraction form
   10,978.48/16,471.58 = 5,435.66/x
3. Step 3: Cross multiply
   10,978.48x = 16,471.58 × 5,435.66
4. Step 4: Simplify right side
   10,978.48x = 89,533,908.54
5. Step 5: Solve for x
   x = 89,533,908.54/10,978.48
6. Step 6: Final answer
   x = 8,155.40