Finding the Fourth Proportional to 2,631.42, 3,948.78 and 2,385.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,631.42 : 3,948.78 = 2,385.12 : x
2. Step 2: Convert to fraction form
   2,631.42/3,948.78 = 2,385.12/x
3. Step 3: Cross multiply
   2,631.42x = 3,948.78 × 2,385.12
4. Step 4: Simplify right side
   2,631.42x = 9,418,314.15
5. Step 5: Solve for x
   x = 9,418,314.15/2,631.42
6. Step 6: Final answer
   x = 3,579.18