Finding the Fourth Proportional to 1,007.84, 1,391.52 and 775.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,007.84 : 1,391.52 = 775.52 : x
2. Step 2: Convert to fraction form
   1,007.84/1,391.52 = 775.52/x
3. Step 3: Cross multiply
   1,007.84x = 1,391.52 × 775.52
4. Step 4: Simplify right side
   1,007.84x = 1,079,151.59
5. Step 5: Solve for x
   x = 1,079,151.59/1,007.84
6. Step 6: Final answer
   x = 1,070.76