Finding the Fourth Proportional to 1,426.68, 2,139.09 and 938.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.68 : 2,139.09 = 938.25 : x
2. Step 2: Convert to fraction form
   1,426.68/2,139.09 = 938.25/x
3. Step 3: Cross multiply
   1,426.68x = 2,139.09 × 938.25
4. Step 4: Simplify right side
   1,426.68x = 2,007,001.19
5. Step 5: Solve for x
   x = 2,007,001.19/1,426.68
6. Step 6: Final answer
   x = 1,406.76