Finding the Fourth Proportional to 2,499.69, 3,749.55 and 856.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,499.69 : 3,749.55 = 856.25 : x
2. Step 2: Convert to fraction form
   2,499.69/3,749.55 = 856.25/x
3. Step 3: Cross multiply
   2,499.69x = 3,749.55 × 856.25
4. Step 4: Simplify right side
   2,499.69x = 3,210,552.19
5. Step 5: Solve for x
   x = 3,210,552.19/2,499.69
6. Step 6: Final answer
   x = 1,284.38