Finding the Fourth Proportional to 1,376.79, 1,898.82 and 879.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.79 : 1,898.82 = 879.45 : x
2. Step 2: Convert to fraction form
   1,376.79/1,898.82 = 879.45/x
3. Step 3: Cross multiply
   1,376.79x = 1,898.82 × 879.45
4. Step 4: Simplify right side
   1,376.79x = 1,669,917.25
5. Step 5: Solve for x
   x = 1,669,917.25/1,376.79
6. Step 6: Final answer
   x = 1,212.91