Finding the Fourth Proportional to 1,360.28, 1,877.06 and 770.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,360.28 : 1,877.06 = 770.86 : x
2. Step 2: Convert to fraction form
   1,360.28/1,877.06 = 770.86/x
3. Step 3: Cross multiply
   1,360.28x = 1,877.06 × 770.86
4. Step 4: Simplify right side
   1,360.28x = 1,446,950.47
5. Step 5: Solve for x
   x = 1,446,950.47/1,360.28
6. Step 6: Final answer
   x = 1,063.72