Finding the Fourth Proportional to 9,900.61, 14,853.21 and 2,880.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900.61 : 14,853.21 = 2,880.79 : x
2. Step 2: Convert to fraction form
   9,900.61/14,853.21 = 2,880.79/x
3. Step 3: Cross multiply
   9,900.61x = 14,853.21 × 2,880.79
4. Step 4: Simplify right side
   9,900.61x = 42,788,978.84
5. Step 5: Solve for x
   x = 42,788,978.84/9,900.61
6. Step 6: Final answer
   x = 4,321.85