Finding the Fourth Proportional to 1,139.66, 1,572.52 and 719.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.66 : 1,572.52 = 719.72 : x
2. Step 2: Convert to fraction form
   1,139.66/1,572.52 = 719.72/x
3. Step 3: Cross multiply
   1,139.66x = 1,572.52 × 719.72
4. Step 4: Simplify right side
   1,139.66x = 1,131,774.09
5. Step 5: Solve for x
   x = 1,131,774.09/1,139.66
6. Step 6: Final answer
   x = 993.08