Finding the Fourth Proportional to 1,361.08, 1,878.30 and 771.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.08 : 1,878.30 = 771.62 : x
2. Step 2: Convert to fraction form
   1,361.08/1,878.30 = 771.62/x
3. Step 3: Cross multiply
   1,361.08x = 1,878.30 × 771.62
4. Step 4: Simplify right side
   1,361.08x = 1,449,329.99
5. Step 5: Solve for x
   x = 1,449,329.99/1,361.08
6. Step 6: Final answer
   x = 1,064.84