Finding the Fourth Proportional to 1,359.43, 1,876.37 and 770.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.43 : 1,876.37 = 770.31 : x
2. Step 2: Convert to fraction form
   1,359.43/1,876.37 = 770.31/x
3. Step 3: Cross multiply
   1,359.43x = 1,876.37 × 770.31
4. Step 4: Simplify right side
   1,359.43x = 1,445,382.72
5. Step 5: Solve for x
   x = 1,445,382.72/1,359.43
6. Step 6: Final answer
   x = 1,063.22