Finding the Fourth Proportional to 1,118.07, 1,543.05 and 769.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,118.07 : 1,543.05 = 769.50 : x
2. Step 2: Convert to fraction form
   1,118.07/1,543.05 = 769.50/x
3. Step 3: Cross multiply
   1,118.07x = 1,543.05 × 769.50
4. Step 4: Simplify right side
   1,118.07x = 1,187,376.98
5. Step 5: Solve for x
   x = 1,187,376.98/1,118.07
6. Step 6: Final answer
   x = 1,061.99