Finding the Fourth Proportional to 1,645.61, 2,271.00 and 899.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,645.61 : 2,271.00 = 899.56 : x
2. Step 2: Convert to fraction form
   1,645.61/2,271.00 = 899.56/x
3. Step 3: Cross multiply
   1,645.61x = 2,271.00 × 899.56
4. Step 4: Simplify right side
   1,645.61x = 2,042,897.33
5. Step 5: Solve for x
   x = 2,042,897.33/1,645.61
6. Step 6: Final answer
   x = 1,241.42