Finding the Fourth Proportional to 9,879.12, 14,828.40 and 5,499.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,879.12 : 14,828.40 = 5,499.72 : x
2. Step 2: Convert to fraction form
   9,879.12/14,828.40 = 5,499.72/x
3. Step 3: Cross multiply
   9,879.12x = 14,828.40 × 5,499.72
4. Step 4: Simplify right side
   9,879.12x = 81,552,048.05
5. Step 5: Solve for x
   x = 81,552,048.05/9,879.12
6. Step 6: Final answer
   x = 8,254.99