Finding the Fourth Proportional to 1,434.26, 1,978.80 and 910.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.26 : 1,978.80 = 910.60 : x
2. Step 2: Convert to fraction form
   1,434.26/1,978.80 = 910.60/x
3. Step 3: Cross multiply
   1,434.26x = 1,978.80 × 910.60
4. Step 4: Simplify right side
   1,434.26x = 1,801,886.92
5. Step 5: Solve for x
   x = 1,801,886.92/1,434.26
6. Step 6: Final answer
   x = 1,256.32