Finding the Fourth Proportional to 2,500.17, 3,750.71 and 856.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.17 : 3,750.71 = 856.88 : x
2. Step 2: Convert to fraction form
   2,500.17/3,750.71 = 856.88/x
3. Step 3: Cross multiply
   2,500.17x = 3,750.71 × 856.88
4. Step 4: Simplify right side
   2,500.17x = 3,213,899.41
5. Step 5: Solve for x
   x = 3,213,899.41/2,500.17
6. Step 6: Final answer
   x = 1,285.47