Finding the Fourth Proportional to 1,679.42, 2,517.96 and 856.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.42 : 2,517.96 = 856.10 : x
2. Step 2: Convert to fraction form
   1,679.42/2,517.96 = 856.10/x
3. Step 3: Cross multiply
   1,679.42x = 2,517.96 × 856.10
4. Step 4: Simplify right side
   1,679.42x = 2,155,612.97
5. Step 5: Solve for x
   x = 2,155,612.97/1,679.42
6. Step 6: Final answer
   x = 1,283.55