Finding the Fourth Proportional to 2,068.86, 3,104.91 and 770.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,068.86 : 3,104.91 = 770.40 : x
2. Step 2: Convert to fraction form
   2,068.86/3,104.91 = 770.40/x
3. Step 3: Cross multiply
   2,068.86x = 3,104.91 × 770.40
4. Step 4: Simplify right side
   2,068.86x = 2,392,022.66
5. Step 5: Solve for x
   x = 2,392,022.66/2,068.86
6. Step 6: Final answer
   x = 1,156.20