Finding the Fourth Proportional to 2,499.68, 3,749.10 and 856.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.68 : 3,749.10 = 856.28 : x
2. Step 2: Convert to fraction form
   2,499.68/3,749.10 = 856.28/x
3. Step 3: Cross multiply
   2,499.68x = 3,749.10 × 856.28
4. Step 4: Simplify right side
   2,499.68x = 3,210,279.35
5. Step 5: Solve for x
   x = 3,210,279.35/2,499.68
6. Step 6: Final answer
   x = 1,284.28