Finding the Fourth Proportional to 1,078.24, 1,487.96 and 612.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.24 : 1,487.96 = 612.50 : x
2. Step 2: Convert to fraction form
   1,078.24/1,487.96 = 612.50/x
3. Step 3: Cross multiply
   1,078.24x = 1,487.96 × 612.50
4. Step 4: Simplify right side
   1,078.24x = 911,375.50
5. Step 5: Solve for x
   x = 911,375.50/1,078.24
6. Step 6: Final answer
   x = 845.24