Finding the Fourth Proportional to 2,499.80, 3,750.17 and 856.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.80 : 3,750.17 = 856.58 : x
2. Step 2: Convert to fraction form
   2,499.80/3,750.17 = 856.58/x
3. Step 3: Cross multiply
   2,499.80x = 3,750.17 × 856.58
4. Step 4: Simplify right side
   2,499.80x = 3,212,297.58
5. Step 5: Solve for x
   x = 3,212,297.58/2,499.80
6. Step 6: Final answer
   x = 1,285.02