Finding the Fourth Proportional to 1,149.12, 1,578.72 and 1,010.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,149.12 : 1,578.72 = 1,010.88 : x
2. Step 2: Convert to fraction form
   1,149.12/1,578.72 = 1,010.88/x
3. Step 3: Cross multiply
   1,149.12x = 1,578.72 × 1,010.88
4. Step 4: Simplify right side
   1,149.12x = 1,595,896.47
5. Step 5: Solve for x
   x = 1,595,896.47/1,149.12
6. Step 6: Final answer
   x = 1,388.80