Finding the Fourth Proportional to 8,978.85, 12,387.46 and 5,200.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.85 : 12,387.46 = 5,200.64 : x
2. Step 2: Convert to fraction form
   8,978.85/12,387.46 = 5,200.64/x
3. Step 3: Cross multiply
   8,978.85x = 12,387.46 × 5,200.64
4. Step 4: Simplify right side
   8,978.85x = 64,422,719.97
5. Step 5: Solve for x
   x = 64,422,719.97/8,978.85
6. Step 6: Final answer
   x = 7,174.94