Finding the Fourth Proportional to 1,807.78, 2,494.71 and 979.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,807.78 : 2,494.71 = 979.78 : x
2. Step 2: Convert to fraction form
   1,807.78/2,494.71 = 979.78/x
3. Step 3: Cross multiply
   1,807.78x = 2,494.71 × 979.78
4. Step 4: Simplify right side
   1,807.78x = 2,444,266.96
5. Step 5: Solve for x
   x = 2,444,266.96/1,807.78
6. Step 6: Final answer
   x = 1,352.08