Finding the Fourth Proportional to 1,359.98, 1,876.77 and 770.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.98 : 1,876.77 = 770.55 : x
2. Step 2: Convert to fraction form
   1,359.98/1,876.77 = 770.55/x
3. Step 3: Cross multiply
   1,359.98x = 1,876.77 × 770.55
4. Step 4: Simplify right side
   1,359.98x = 1,446,145.12
5. Step 5: Solve for x
   x = 1,446,145.12/1,359.98
6. Step 6: Final answer
   x = 1,063.36