Finding the Fourth Proportional to 1,359.69, 1,876.26 and 770.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.69 : 1,876.26 = 770.21 : x
2. Step 2: Convert to fraction form
   1,359.69/1,876.26 = 770.21/x
3. Step 3: Cross multiply
   1,359.69x = 1,876.26 × 770.21
4. Step 4: Simplify right side
   1,359.69x = 1,445,114.76
5. Step 5: Solve for x
   x = 1,445,114.76/1,359.69
6. Step 6: Final answer
   x = 1,062.83