Finding the Fourth Proportional to 1,434.40, 1,978.32 and 910.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.40 : 1,978.32 = 910.56 : x
2. Step 2: Convert to fraction form
   1,434.40/1,978.32 = 910.56/x
3. Step 3: Cross multiply
   1,434.40x = 1,978.32 × 910.56
4. Step 4: Simplify right side
   1,434.40x = 1,801,379.06
5. Step 5: Solve for x
   x = 1,801,379.06/1,434.40
6. Step 6: Final answer
   x = 1,255.84