Finding the Fourth Proportional to 1,562.09, 2,155.61 and 899.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,562.09 : 2,155.61 = 899.03 : x
2. Step 2: Convert to fraction form
   1,562.09/2,155.61 = 899.03/x
3. Step 3: Cross multiply
   1,562.09x = 2,155.61 × 899.03
4. Step 4: Simplify right side
   1,562.09x = 1,937,965.69
5. Step 5: Solve for x
   x = 1,937,965.69/1,562.09
6. Step 6: Final answer
   x = 1,240.63