Finding the Fourth Proportional to 1,139.30, 1,572.56 and 746.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.30 : 1,572.56 = 746.35 : x
2. Step 2: Convert to fraction form
   1,139.30/1,572.56 = 746.35/x
3. Step 3: Cross multiply
   1,139.30x = 1,572.56 × 746.35
4. Step 4: Simplify right side
   1,139.30x = 1,173,680.16
5. Step 5: Solve for x
   x = 1,173,680.16/1,139.30
6. Step 6: Final answer
   x = 1,030.18