Finding the Fourth Proportional to 3,915.02, 5,402.79 and 2,146.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.02 : 5,402.79 = 2,146.61 : x
2. Step 2: Convert to fraction form
   3,915.02/5,402.79 = 2,146.61/x
3. Step 3: Cross multiply
   3,915.02x = 5,402.79 × 2,146.61
4. Step 4: Simplify right side
   3,915.02x = 11,597,656.03
5. Step 5: Solve for x
   x = 11,597,656.03/3,915.02
6. Step 6: Final answer
   x = 2,962.35