Finding the Fourth Proportional to 3,925.83, 5,417.78 and 2,157.60

Step by Step Solution

1. Step 1: Write the proportion equation
   3,925.83 : 5,417.78 = 2,157.60 : x
2. Step 2: Convert to fraction form
   3,925.83/5,417.78 = 2,157.60/x
3. Step 3: Cross multiply
   3,925.83x = 5,417.78 × 2,157.60
4. Step 4: Simplify right side
   3,925.83x = 11,689,391.34
5. Step 5: Solve for x
   x = 11,689,391.34/3,925.83
6. Step 6: Final answer
   x = 2,977.56