Finding the Fourth Proportional to 1,392.60, 1,921.89 and 803.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.60 : 1,921.89 = 803.22 : x
2. Step 2: Convert to fraction form
   1,392.60/1,921.89 = 803.22/x
3. Step 3: Cross multiply
   1,392.60x = 1,921.89 × 803.22
4. Step 4: Simplify right side
   1,392.60x = 1,543,700.49
5. Step 5: Solve for x
   x = 1,543,700.49/1,392.60
6. Step 6: Final answer
   x = 1,108.50