Finding the Fourth Proportional to 2,500.74, 3,750.84 and 856.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,500.74 : 3,750.84 = 856.98 : x
2. Step 2: Convert to fraction form
   2,500.74/3,750.84 = 856.98/x
3. Step 3: Cross multiply
   2,500.74x = 3,750.84 × 856.98
4. Step 4: Simplify right side
   2,500.74x = 3,214,394.86
5. Step 5: Solve for x
   x = 3,214,394.86/2,500.74
6. Step 6: Final answer
   x = 1,285.38