Finding the Fourth Proportional to 1,359.87, 1,876.55 and 770.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.87 : 1,876.55 = 770.41 : x
2. Step 2: Convert to fraction form
   1,359.87/1,876.55 = 770.41/x
3. Step 3: Cross multiply
   1,359.87x = 1,876.55 × 770.41
4. Step 4: Simplify right side
   1,359.87x = 1,445,712.89
5. Step 5: Solve for x
   x = 1,445,712.89/1,359.87
6. Step 6: Final answer
   x = 1,063.13