Finding the Fourth Proportional to 8,978.29, 12,389.37 and 4,998.64

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.29 : 12,389.37 = 4,998.64 : x
2. Step 2: Convert to fraction form
   8,978.29/12,389.37 = 4,998.64/x
3. Step 3: Cross multiply
   8,978.29x = 12,389.37 × 4,998.64
4. Step 4: Simplify right side
   8,978.29x = 61,930,000.46
5. Step 5: Solve for x
   x = 61,930,000.46/8,978.29
6. Step 6: Final answer
   x = 6,897.75