Finding the Fourth Proportional to 1,645.98, 2,271.51 and 899.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.98 : 2,271.51 = 899.89 : x
2. Step 2: Convert to fraction form
   1,645.98/2,271.51 = 899.89/x
3. Step 3: Cross multiply
   1,645.98x = 2,271.51 × 899.89
4. Step 4: Simplify right side
   1,645.98x = 2,044,116.23
5. Step 5: Solve for x
   x = 2,044,116.23/1,645.98
6. Step 6: Final answer
   x = 1,241.89