Finding the Fourth Proportional to 1,093.71, 1,508.12 and 715.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,093.71 : 1,508.12 = 715.78 : x
2. Step 2: Convert to fraction form
   1,093.71/1,508.12 = 715.78/x
3. Step 3: Cross multiply
   1,093.71x = 1,508.12 × 715.78
4. Step 4: Simplify right side
   1,093.71x = 1,079,480.15
5. Step 5: Solve for x
   x = 1,079,480.15/1,093.71
6. Step 6: Final answer
   x = 986.99