Finding the Fourth Proportional to 1,359.89, 1,876.60 and 770.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.89 : 1,876.60 = 770.38 : x
2. Step 2: Convert to fraction form
   1,359.89/1,876.60 = 770.38/x
3. Step 3: Cross multiply
   1,359.89x = 1,876.60 × 770.38
4. Step 4: Simplify right side
   1,359.89x = 1,445,691.38
5. Step 5: Solve for x
   x = 1,445,691.38/1,359.89
6. Step 6: Final answer
   x = 1,063.10