Finding the Fourth Proportional to 1,434.68, 1,979.86 and 938.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,434.68 : 1,979.86 = 938.16 : x
2. Step 2: Convert to fraction form
   1,434.68/1,979.86 = 938.16/x
3. Step 3: Cross multiply
   1,434.68x = 1,979.86 × 938.16
4. Step 4: Simplify right side
   1,434.68x = 1,857,425.46
5. Step 5: Solve for x
   x = 1,857,425.46/1,434.68
6. Step 6: Final answer
   x = 1,294.66