Finding the Fourth Proportional to 1,392.02, 1,921.65 and 868.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.02 : 1,921.65 = 868.82 : x
2. Step 2: Convert to fraction form
   1,392.02/1,921.65 = 868.82/x
3. Step 3: Cross multiply
   1,392.02x = 1,921.65 × 868.82
4. Step 4: Simplify right side
   1,392.02x = 1,669,567.95
5. Step 5: Solve for x
   x = 1,669,567.95/1,392.02
6. Step 6: Final answer
   x = 1,199.39