Finding the Fourth Proportional to 1,078.88, 1,618.78 and 462.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.88 : 1,618.78 = 462.72 : x
2. Step 2: Convert to fraction form
   1,078.88/1,618.78 = 462.72/x
3. Step 3: Cross multiply
   1,078.88x = 1,618.78 × 462.72
4. Step 4: Simplify right side
   1,078.88x = 749,041.88
5. Step 5: Solve for x
   x = 749,041.88/1,078.88
6. Step 6: Final answer
   x = 694.28