Finding the Fourth Proportional to 1,359.68, 1,876.20 and 770.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,359.68 : 1,876.20 = 770.09 : x
2. Step 2: Convert to fraction form
   1,359.68/1,876.20 = 770.09/x
3. Step 3: Cross multiply
   1,359.68x = 1,876.20 × 770.09
4. Step 4: Simplify right side
   1,359.68x = 1,444,833.48
5. Step 5: Solve for x
   x = 1,444,833.48/1,359.68
6. Step 6: Final answer
   x = 1,062.63