Finding the Fourth Proportional to 1,151.05, 1,587.94 and 777.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,151.05 : 1,587.94 = 777.89 : x
2. Step 2: Convert to fraction form
   1,151.05/1,587.94 = 777.89/x
3. Step 3: Cross multiply
   1,151.05x = 1,587.94 × 777.89
4. Step 4: Simplify right side
   1,151.05x = 1,235,247.59
5. Step 5: Solve for x
   x = 1,235,247.59/1,151.05
6. Step 6: Final answer
   x = 1,073.15