Finding the Fourth Proportional to 2,499.86, 3,750.46 and 856.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.86 : 3,750.46 = 856.42 : x
2. Step 2: Convert to fraction form
   2,499.86/3,750.46 = 856.42/x
3. Step 3: Cross multiply
   2,499.86x = 3,750.46 × 856.42
4. Step 4: Simplify right side
   2,499.86x = 3,211,968.95
5. Step 5: Solve for x
   x = 3,211,968.95/2,499.86
6. Step 6: Final answer
   x = 1,284.86