Finding the Fourth Proportional to 1,424.02, 1,965.57 and 900.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,424.02 : 1,965.57 = 900.40 : x
2. Step 2: Convert to fraction form
   1,424.02/1,965.57 = 900.40/x
3. Step 3: Cross multiply
   1,424.02x = 1,965.57 × 900.40
4. Step 4: Simplify right side
   1,424.02x = 1,769,799.23
5. Step 5: Solve for x
   x = 1,769,799.23/1,424.02
6. Step 6: Final answer
   x = 1,242.82