Finding the Fourth Proportional to 1,677.24, 2,518.18 and 856.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,677.24 : 2,518.18 = 856.10 : x
2. Step 2: Convert to fraction form
   1,677.24/2,518.18 = 856.10/x
3. Step 3: Cross multiply
   1,677.24x = 2,518.18 × 856.10
4. Step 4: Simplify right side
   1,677.24x = 2,155,818.05
5. Step 5: Solve for x
   x = 2,155,818.05/1,677.24
6. Step 6: Final answer
   x = 1,285.34