Finding the Fourth Proportional to 1,256.79, 1,891.78 and 1,068.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,256.79 : 1,891.78 = 1,068.87 : x
2. Step 2: Convert to fraction form
   1,256.79/1,891.78 = 1,068.87/x
3. Step 3: Cross multiply
   1,256.79x = 1,891.78 × 1,068.87
4. Step 4: Simplify right side
   1,256.79x = 2,022,066.89
5. Step 5: Solve for x
   x = 2,022,066.89/1,256.79
6. Step 6: Final answer
   x = 1,608.91