Finding the Fourth Proportional to 2,068.50, 2,855.20 and 1,397.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,068.50 : 2,855.20 = 1,397.28 : x
2. Step 2: Convert to fraction form
   2,068.50/2,855.20 = 1,397.28/x
3. Step 3: Cross multiply
   2,068.50x = 2,855.20 × 1,397.28
4. Step 4: Simplify right side
   2,068.50x = 3,989,513.86
5. Step 5: Solve for x
   x = 3,989,513.86/2,068.50
6. Step 6: Final answer
   x = 1,928.70