Finding the Fourth Proportional to 1,321.86, 1,982.37 and 696.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.86 : 1,982.37 = 696.78 : x
2. Step 2: Convert to fraction form
   1,321.86/1,982.37 = 696.78/x
3. Step 3: Cross multiply
   1,321.86x = 1,982.37 × 696.78
4. Step 4: Simplify right side
   1,321.86x = 1,381,275.77
5. Step 5: Solve for x
   x = 1,381,275.77/1,321.86
6. Step 6: Final answer
   x = 1,044.95