Finding the Fourth Proportional to 1,377.64, 1,901.22 and 911.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,377.64 : 1,901.22 = 911.56 : x
2. Step 2: Convert to fraction form
   1,377.64/1,901.22 = 911.56/x
3. Step 3: Cross multiply
   1,377.64x = 1,901.22 × 911.56
4. Step 4: Simplify right side
   1,377.64x = 1,733,076.10
5. Step 5: Solve for x
   x = 1,733,076.10/1,377.64
6. Step 6: Final answer
   x = 1,258.00