Finding the Fourth Proportional to 1,854.62, 2,557.42 and 1,224.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,854.62 : 2,557.42 = 1,224.32 : x
2. Step 2: Convert to fraction form
   1,854.62/2,557.42 = 1,224.32/x
3. Step 3: Cross multiply
   1,854.62x = 2,557.42 × 1,224.32
4. Step 4: Simplify right side
   1,854.62x = 3,131,100.45
5. Step 5: Solve for x
   x = 3,131,100.45/1,854.62
6. Step 6: Final answer
   x = 1,688.27