Finding the Fourth Proportional to 1,392.83, 1,921.54 and 803.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.83 : 1,921.54 = 803.04 : x
2. Step 2: Convert to fraction form
   1,392.83/1,921.54 = 803.04/x
3. Step 3: Cross multiply
   1,392.83x = 1,921.54 × 803.04
4. Step 4: Simplify right side
   1,392.83x = 1,543,069.47
5. Step 5: Solve for x
   x = 1,543,069.47/1,392.83
6. Step 6: Final answer
   x = 1,107.87