Finding the Fourth Proportional to 1,626.15, 2,435.40 and 801.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,626.15 : 2,435.40 = 801.78 : x
2. Step 2: Convert to fraction form
   1,626.15/2,435.40 = 801.78/x
3. Step 3: Cross multiply
   1,626.15x = 2,435.40 × 801.78
4. Step 4: Simplify right side
   1,626.15x = 1,952,655.01
5. Step 5: Solve for x
   x = 1,952,655.01/1,626.15
6. Step 6: Final answer
   x = 1,200.78