Finding the Fourth Proportional to 1,359.80, 1,876.86 and 770.68

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.80 : 1,876.86 = 770.68 : x
2. Step 2: Convert to fraction form
   1,359.80/1,876.86 = 770.68/x
3. Step 3: Cross multiply
   1,359.80x = 1,876.86 × 770.68
4. Step 4: Simplify right side
   1,359.80x = 1,446,454.61
5. Step 5: Solve for x
   x = 1,446,454.61/1,359.80
6. Step 6: Final answer
   x = 1,063.73