Finding the Fourth Proportional to 1,405.48, 1,939.49 and 807.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.48 : 1,939.49 = 807.56 : x
2. Step 2: Convert to fraction form
   1,405.48/1,939.49 = 807.56/x
3. Step 3: Cross multiply
   1,405.48x = 1,939.49 × 807.56
4. Step 4: Simplify right side
   1,405.48x = 1,566,254.54
5. Step 5: Solve for x
   x = 1,566,254.54/1,405.48
6. Step 6: Final answer
   x = 1,114.39