Finding the Fourth Proportional to 1,377.12, 1,901.32 and 879.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.12 : 1,901.32 = 879.96 : x
2. Step 2: Convert to fraction form
   1,377.12/1,901.32 = 879.96/x
3. Step 3: Cross multiply
   1,377.12x = 1,901.32 × 879.96
4. Step 4: Simplify right side
   1,377.12x = 1,673,085.55
5. Step 5: Solve for x
   x = 1,673,085.55/1,377.12
6. Step 6: Final answer
   x = 1,214.92