Finding the Fourth Proportional to 1,377.84, 1,900.44 and 912.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.84 : 1,900.44 = 912.72 : x
2. Step 2: Convert to fraction form
   1,377.84/1,900.44 = 912.72/x
3. Step 3: Cross multiply
   1,377.84x = 1,900.44 × 912.72
4. Step 4: Simplify right side
   1,377.84x = 1,734,569.60
5. Step 5: Solve for x
   x = 1,734,569.60/1,377.84
6. Step 6: Final answer
   x = 1,258.90