Finding the Fourth Proportional to 9,885.20, 14,828.56 and 2,865.31

Step by Step Solution

1. Step 1: Write the proportion equation
   9,885.20 : 14,828.56 = 2,865.31 : x
2. Step 2: Convert to fraction form
   9,885.20/14,828.56 = 2,865.31/x
3. Step 3: Cross multiply
   9,885.20x = 14,828.56 × 2,865.31
4. Step 4: Simplify right side
   9,885.20x = 42,488,421.25
5. Step 5: Solve for x
   x = 42,488,421.25/9,885.20
6. Step 6: Final answer
   x = 4,298.19