Finding the Fourth Proportional to 3,540.18, 4,885.72 and 2,123.92

Step by Step Solution

1. Step 1: Write the proportion equation
   3,540.18 : 4,885.72 = 2,123.92 : x
2. Step 2: Convert to fraction form
   3,540.18/4,885.72 = 2,123.92/x
3. Step 3: Cross multiply
   3,540.18x = 4,885.72 × 2,123.92
4. Step 4: Simplify right side
   3,540.18x = 10,376,878.42
5. Step 5: Solve for x
   x = 10,376,878.42/3,540.18
6. Step 6: Final answer
   x = 2,931.17