Finding the Fourth Proportional to 1,391.52, 2,087.34 and 774.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.52 : 2,087.34 = 774.76 : x
2. Step 2: Convert to fraction form
   1,391.52/2,087.34 = 774.76/x
3. Step 3: Cross multiply
   1,391.52x = 2,087.34 × 774.76
4. Step 4: Simplify right side
   1,391.52x = 1,617,191.10
5. Step 5: Solve for x
   x = 1,617,191.10/1,391.52
6. Step 6: Final answer
   x = 1,162.18