Finding the Fourth Proportional to 1,425.18, 1,965.90 and 900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.18 : 1,965.90 = 900.30 : x
2. Step 2: Convert to fraction form
   1,425.18/1,965.90 = 900.30/x
3. Step 3: Cross multiply
   1,425.18x = 1,965.90 × 900.30
4. Step 4: Simplify right side
   1,425.18x = 1,769,899.77
5. Step 5: Solve for x
   x = 1,769,899.77/1,425.18
6. Step 6: Final answer
   x = 1,241.88