Finding the Fourth Proportional to 1,643.78, 2,464.72 and 1,124.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.78 : 2,464.72 = 1,124.58 : x
2. Step 2: Convert to fraction form
   1,643.78/2,464.72 = 1,124.58/x
3. Step 3: Cross multiply
   1,643.78x = 2,464.72 × 1,124.58
4. Step 4: Simplify right side
   1,643.78x = 2,771,774.82
5. Step 5: Solve for x
   x = 2,771,774.82/1,643.78
6. Step 6: Final answer
   x = 1,686.22