Finding the Fourth Proportional to 1,139.32, 1,572.78 and 746.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.32 : 1,572.78 = 746.47 : x
2. Step 2: Convert to fraction form
   1,139.32/1,572.78 = 746.47/x
3. Step 3: Cross multiply
   1,139.32x = 1,572.78 × 746.47
4. Step 4: Simplify right side
   1,139.32x = 1,174,033.09
5. Step 5: Solve for x
   x = 1,174,033.09/1,139.32
6. Step 6: Final answer
   x = 1,030.47