Finding the Fourth Proportional to 3,915.98, 5,404.05 and 2,147.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.98 : 5,404.05 = 2,147.61 : x
2. Step 2: Convert to fraction form
   3,915.98/5,404.05 = 2,147.61/x
3. Step 3: Cross multiply
   3,915.98x = 5,404.05 × 2,147.61
4. Step 4: Simplify right side
   3,915.98x = 11,605,791.82
5. Step 5: Solve for x
   x = 11,605,791.82/3,915.98
6. Step 6: Final answer
   x = 2,963.70