Finding the Fourth Proportional to 1,384.73, 1,910.45 and 880.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.73 : 1,910.45 = 880.81 : x
2. Step 2: Convert to fraction form
   1,384.73/1,910.45 = 880.81/x
3. Step 3: Cross multiply
   1,384.73x = 1,910.45 × 880.81
4. Step 4: Simplify right side
   1,384.73x = 1,682,743.46
5. Step 5: Solve for x
   x = 1,682,743.46/1,384.73
6. Step 6: Final answer
   x = 1,215.21