Finding the Fourth Proportional to 2,807.61, 4,205.78 and 1,397.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807.61 : 4,205.78 = 1,397.78 : x
2. Step 2: Convert to fraction form
   2,807.61/4,205.78 = 1,397.78/x
3. Step 3: Cross multiply
   2,807.61x = 4,205.78 × 1,397.78
4. Step 4: Simplify right side
   2,807.61x = 5,878,749.16
5. Step 5: Solve for x
   x = 5,878,749.16/2,807.61
6. Step 6: Final answer
   x = 2,093.86