Finding the Fourth Proportional to 1,562.81, 2,157.20 and 899.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.81 : 2,157.20 = 899.83 : x
2. Step 2: Convert to fraction form
   1,562.81/2,157.20 = 899.83/x
3. Step 3: Cross multiply
   1,562.81x = 2,157.20 × 899.83
4. Step 4: Simplify right side
   1,562.81x = 1,941,105.63
5. Step 5: Solve for x
   x = 1,941,105.63/1,562.81
6. Step 6: Final answer
   x = 1,242.06