Finding the Fourth Proportional to 1,617.22, 2,426.89 and 887.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,617.22 : 2,426.89 = 887.31 : x
2. Step 2: Convert to fraction form
   1,617.22/2,426.89 = 887.31/x
3. Step 3: Cross multiply
   1,617.22x = 2,426.89 × 887.31
4. Step 4: Simplify right side
   1,617.22x = 2,153,403.77
5. Step 5: Solve for x
   x = 2,153,403.77/1,617.22
6. Step 6: Final answer
   x = 1,331.55