Finding the Fourth Proportional to 1,377.34, 1,899.79 and 879.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.34 : 1,899.79 = 879.76 : x
2. Step 2: Convert to fraction form
   1,377.34/1,899.79 = 879.76/x
3. Step 3: Cross multiply
   1,377.34x = 1,899.79 × 879.76
4. Step 4: Simplify right side
   1,377.34x = 1,671,355.60
5. Step 5: Solve for x
   x = 1,671,355.60/1,377.34
6. Step 6: Final answer
   x = 1,213.47