Finding the Fourth Proportional to 3,925.79, 5,417.59 and 2,157.50

Step by Step Solution

1. Step 1: Write the proportion equation
   3,925.79 : 5,417.59 = 2,157.50 : x
2. Step 2: Convert to fraction form
   3,925.79/5,417.59 = 2,157.50/x
3. Step 3: Cross multiply
   3,925.79x = 5,417.59 × 2,157.50
4. Step 4: Simplify right side
   3,925.79x = 11,688,423.34
5. Step 5: Solve for x
   x = 11,688,423.34/3,925.79
6. Step 6: Final answer
   x = 2,977.35