Finding the Fourth Proportional to 10,978.56, 16,470.48 and 5,132.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,978.56 : 16,470.48 = 5,132.40 : x
2. Step 2: Convert to fraction form
   10,978.56/16,470.48 = 5,132.40/x
3. Step 3: Cross multiply
   10,978.56x = 16,470.48 × 5,132.40
4. Step 4: Simplify right side
   10,978.56x = 84,533,091.55
5. Step 5: Solve for x
   x = 84,533,091.55/10,978.56
6. Step 6: Final answer
   x = 7,699.83