Finding the Fourth Proportional to 3,915.95, 5,404.27 and 2,213.87

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.95 : 5,404.27 = 2,213.87 : x
2. Step 2: Convert to fraction form
   3,915.95/5,404.27 = 2,213.87/x
3. Step 3: Cross multiply
   3,915.95x = 5,404.27 × 2,213.87
4. Step 4: Simplify right side
   3,915.95x = 11,964,322.82
5. Step 5: Solve for x
   x = 11,964,322.82/3,915.95
6. Step 6: Final answer
   x = 3,055.28