Finding the Fourth Proportional to 9,899.61, 14,851.71 and 2,879.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,899.61 : 14,851.71 = 2,879.79 : x
2. Step 2: Convert to fraction form
   9,899.61/14,851.71 = 2,879.79/x
3. Step 3: Cross multiply
   9,899.61x = 14,851.71 × 2,879.79
4. Step 4: Simplify right side
   9,899.61x = 42,769,805.94
5. Step 5: Solve for x
   x = 42,769,805.94/9,899.61
6. Step 6: Final answer
   x = 4,320.35