Finding the Fourth Proportional to 1,392.50, 1,921.83 and 803.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.50 : 1,921.83 = 803.04 : x
2. Step 2: Convert to fraction form
   1,392.50/1,921.83 = 803.04/x
3. Step 3: Cross multiply
   1,392.50x = 1,921.83 × 803.04
4. Step 4: Simplify right side
   1,392.50x = 1,543,301.55
5. Step 5: Solve for x
   x = 1,543,301.55/1,392.50
6. Step 6: Final answer
   x = 1,108.29