Finding the Fourth Proportional to 1,393.10, 1,922.58 and 803.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,393.10 : 1,922.58 = 803.72 : x
2. Step 2: Convert to fraction form
   1,393.10/1,922.58 = 803.72/x
3. Step 3: Cross multiply
   1,393.10x = 1,922.58 × 803.72
4. Step 4: Simplify right side
   1,393.10x = 1,545,216.00
5. Step 5: Solve for x
   x = 1,545,216.00/1,393.10
6. Step 6: Final answer
   x = 1,109.19