Finding the Fourth Proportional to 1,645.53, 2,270.72 and 899.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.53 : 2,270.72 = 899.34 : x
2. Step 2: Convert to fraction form
   1,645.53/2,270.72 = 899.34/x
3. Step 3: Cross multiply
   1,645.53x = 2,270.72 × 899.34
4. Step 4: Simplify right side
   1,645.53x = 2,042,149.32
5. Step 5: Solve for x
   x = 2,042,149.32/1,645.53
6. Step 6: Final answer
   x = 1,241.03