Finding the Fourth Proportional to 1,139.10, 1,572.14 and 719.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.10 : 1,572.14 = 719.52 : x
2. Step 2: Convert to fraction form
   1,139.10/1,572.14 = 719.52/x
3. Step 3: Cross multiply
   1,139.10x = 1,572.14 × 719.52
4. Step 4: Simplify right side
   1,139.10x = 1,131,186.17
5. Step 5: Solve for x
   x = 1,131,186.17/1,139.10
6. Step 6: Final answer
   x = 993.05