Finding the Fourth Proportional to 9,978.18, 14,940.48 and 5,583.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.18 : 14,940.48 = 5,583.12 : x
2. Step 2: Convert to fraction form
   9,978.18/14,940.48 = 5,583.12/x
3. Step 3: Cross multiply
   9,978.18x = 14,940.48 × 5,583.12
4. Step 4: Simplify right side
   9,978.18x = 83,414,492.70
5. Step 5: Solve for x
   x = 83,414,492.70/9,978.18
6. Step 6: Final answer
   x = 8,359.69