Finding the Fourth Proportional to 1,139.48, 1,572.06 and 746.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.48 : 1,572.06 = 746.72 : x
2. Step 2: Convert to fraction form
   1,139.48/1,572.06 = 746.72/x
3. Step 3: Cross multiply
   1,139.48x = 1,572.06 × 746.72
4. Step 4: Simplify right side
   1,139.48x = 1,173,888.64
5. Step 5: Solve for x
   x = 1,173,888.64/1,139.48
6. Step 6: Final answer
   x = 1,030.20