Finding the Fourth Proportional to 1,456.20, 2,179.02 and 807.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,456.20 : 2,179.02 = 807.56 : x
2. Step 2: Convert to fraction form
   1,456.20/2,179.02 = 807.56/x
3. Step 3: Cross multiply
   1,456.20x = 2,179.02 × 807.56
4. Step 4: Simplify right side
   1,456.20x = 1,759,689.39
5. Step 5: Solve for x
   x = 1,759,689.39/1,456.20
6. Step 6: Final answer
   x = 1,208.41