Finding the Fourth Proportional to 1,487.76, 2,229.81 and 1,078.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,487.76 : 2,229.81 = 1,078.30 : x
2. Step 2: Convert to fraction form
   1,487.76/2,229.81 = 1,078.30/x
3. Step 3: Cross multiply
   1,487.76x = 2,229.81 × 1,078.30
4. Step 4: Simplify right side
   1,487.76x = 2,404,404.12
5. Step 5: Solve for x
   x = 2,404,404.12/1,487.76
6. Step 6: Final answer
   x = 1,616.12