Finding the Fourth Proportional to 1,434.60, 1,978.17 and 936.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.60 : 1,978.17 = 936.30 : x
2. Step 2: Convert to fraction form
   1,434.60/1,978.17 = 936.30/x
3. Step 3: Cross multiply
   1,434.60x = 1,978.17 × 936.30
4. Step 4: Simplify right side
   1,434.60x = 1,852,160.57
5. Step 5: Solve for x
   x = 1,852,160.57/1,434.60
6. Step 6: Final answer
   x = 1,291.06