Finding the Fourth Proportional to 1,120.30, 1,543.71 and 789.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,120.30 : 1,543.71 = 789.10 : x
2. Step 2: Convert to fraction form
   1,120.30/1,543.71 = 789.10/x
3. Step 3: Cross multiply
   1,120.30x = 1,543.71 × 789.10
4. Step 4: Simplify right side
   1,120.30x = 1,218,141.56
5. Step 5: Solve for x
   x = 1,218,141.56/1,120.30
6. Step 6: Final answer
   x = 1,087.34