Finding the Fourth Proportional to 1,039.55, 1,560.06 and 766.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.55 : 1,560.06 = 766.35 : x
2. Step 2: Convert to fraction form
   1,039.55/1,560.06 = 766.35/x
3. Step 3: Cross multiply
   1,039.55x = 1,560.06 × 766.35
4. Step 4: Simplify right side
   1,039.55x = 1,195,551.98
5. Step 5: Solve for x
   x = 1,195,551.98/1,039.55
6. Step 6: Final answer
   x = 1,150.07