Finding the Fourth Proportional to 1,139.63, 1,572.23 and 719.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.63 : 1,572.23 = 719.82 : x
2. Step 2: Convert to fraction form
   1,139.63/1,572.23 = 719.82/x
3. Step 3: Cross multiply
   1,139.63x = 1,572.23 × 719.82
4. Step 4: Simplify right side
   1,139.63x = 1,131,724.40
5. Step 5: Solve for x
   x = 1,131,724.40/1,139.63
6. Step 6: Final answer
   x = 993.07