Finding the Fourth Proportional to 1,646.31, 2,271.94 and 900.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,646.31 : 2,271.94 = 900.30 : x
2. Step 2: Convert to fraction form
   1,646.31/2,271.94 = 900.30/x
3. Step 3: Cross multiply
   1,646.31x = 2,271.94 × 900.30
4. Step 4: Simplify right side
   1,646.31x = 2,045,425.33
5. Step 5: Solve for x
   x = 2,045,425.33/1,646.31
6. Step 6: Final answer
   x = 1,242.43