Finding the Fourth Proportional to 1,563.27, 2,156.65 and 899.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,563.27 : 2,156.65 = 899.99 : x
2. Step 2: Convert to fraction form
   1,563.27/2,156.65 = 899.99/x
3. Step 3: Cross multiply
   1,563.27x = 2,156.65 × 899.99
4. Step 4: Simplify right side
   1,563.27x = 1,940,954.95
5. Step 5: Solve for x
   x = 1,940,954.95/1,563.27
6. Step 6: Final answer
   x = 1,241.60