Finding the Fourth Proportional to 1,392.43, 1,921.71 and 803.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.43 : 1,921.71 = 803.02 : x
2. Step 2: Convert to fraction form
   1,392.43/1,921.71 = 803.02/x
3. Step 3: Cross multiply
   1,392.43x = 1,921.71 × 803.02
4. Step 4: Simplify right side
   1,392.43x = 1,543,171.56
5. Step 5: Solve for x
   x = 1,543,171.56/1,392.43
6. Step 6: Final answer
   x = 1,108.26