Finding the Fourth Proportional to 9,990.24, 14,978.88 and 5,376.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990.24 : 14,978.88 = 5,376.48 : x
2. Step 2: Convert to fraction form
   9,990.24/14,978.88 = 5,376.48/x
3. Step 3: Cross multiply
   9,990.24x = 14,978.88 × 5,376.48
4. Step 4: Simplify right side
   9,990.24x = 80,533,648.74
5. Step 5: Solve for x
   x = 80,533,648.74/9,990.24
6. Step 6: Final answer
   x = 8,061.23