Finding the Fourth Proportional to 1,377.79, 1,899.89 and 880.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.79 : 1,899.89 = 880.45 : x
2. Step 2: Convert to fraction form
   1,377.79/1,899.89 = 880.45/x
3. Step 3: Cross multiply
   1,377.79x = 1,899.89 × 880.45
4. Step 4: Simplify right side
   1,377.79x = 1,672,758.15
5. Step 5: Solve for x
   x = 1,672,758.15/1,377.79
6. Step 6: Final answer
   x = 1,214.09