Finding the Fourth Proportional to 1,399.88, 1,932.05 and 802.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.88 : 1,932.05 = 802.39 : x
2. Step 2: Convert to fraction form
   1,399.88/1,932.05 = 802.39/x
3. Step 3: Cross multiply
   1,399.88x = 1,932.05 × 802.39
4. Step 4: Simplify right side
   1,399.88x = 1,550,257.60
5. Step 5: Solve for x
   x = 1,550,257.60/1,399.88
6. Step 6: Final answer
   x = 1,107.42