Finding the Fourth Proportional to 8,978.54, 12,389.92 and 5,000

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.54 : 12,389.92 = 5,000 : x
2. Step 2: Convert to fraction form
   8,978.54/12,389.92 = 5,000/x
3. Step 3: Cross multiply
   8,978.54x = 12,389.92 × 5,000
4. Step 4: Simplify right side
   8,978.54x = 61,949,600
5. Step 5: Solve for x
   x = 61,949,600/8,978.54
6. Step 6: Final answer
   x = 6,899.74