Finding the Fourth Proportional to 1,361.40, 1,878.76 and 801.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,361.40 : 1,878.76 = 801.89 : x
2. Step 2: Convert to fraction form
   1,361.40/1,878.76 = 801.89/x
3. Step 3: Cross multiply
   1,361.40x = 1,878.76 × 801.89
4. Step 4: Simplify right side
   1,361.40x = 1,506,558.86
5. Step 5: Solve for x
   x = 1,506,558.86/1,361.40
6. Step 6: Final answer
   x = 1,106.62