Finding the Fourth Proportional to 1,426.40, 1,968.96 and 903.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,426.40 : 1,968.96 = 903.20 : x
2. Step 2: Convert to fraction form
   1,426.40/1,968.96 = 903.20/x
3. Step 3: Cross multiply
   1,426.40x = 1,968.96 × 903.20
4. Step 4: Simplify right side
   1,426.40x = 1,778,364.67
5. Step 5: Solve for x
   x = 1,778,364.67/1,426.40
6. Step 6: Final answer
   x = 1,246.75