Finding the Fourth Proportional to 3,915.30, 5,402.90 and 2,146.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.30 : 5,402.90 = 2,146.86 : x
2. Step 2: Convert to fraction form
   3,915.30/5,402.90 = 2,146.86/x
3. Step 3: Cross multiply
   3,915.30x = 5,402.90 × 2,146.86
4. Step 4: Simplify right side
   3,915.30x = 11,599,269.89
5. Step 5: Solve for x
   x = 11,599,269.89/3,915.30
6. Step 6: Final answer
   x = 2,962.55