Finding the Fourth Proportional to 1,360.39, 1,877.42 and 770.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.39 : 1,877.42 = 770.89 : x
2. Step 2: Convert to fraction form
   1,360.39/1,877.42 = 770.89/x
3. Step 3: Cross multiply
   1,360.39x = 1,877.42 × 770.89
4. Step 4: Simplify right side
   1,360.39x = 1,447,284.30
5. Step 5: Solve for x
   x = 1,447,284.30/1,360.39
6. Step 6: Final answer
   x = 1,063.87