Finding the Fourth Proportional to 1,152.67, 1,587.46 and 1,078.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.67 : 1,587.46 = 1,078.55 : x
2. Step 2: Convert to fraction form
   1,152.67/1,587.46 = 1,078.55/x
3. Step 3: Cross multiply
   1,152.67x = 1,587.46 × 1,078.55
4. Step 4: Simplify right side
   1,152.67x = 1,712,154.98
5. Step 5: Solve for x
   x = 1,712,154.98/1,152.67
6. Step 6: Final answer
   x = 1,485.38