Finding the Fourth Proportional to 1,114.80, 1,538.30 and 617.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,114.80 : 1,538.30 = 617.31 : x
2. Step 2: Convert to fraction form
   1,114.80/1,538.30 = 617.31/x
3. Step 3: Cross multiply
   1,114.80x = 1,538.30 × 617.31
4. Step 4: Simplify right side
   1,114.80x = 949,609.50
5. Step 5: Solve for x
   x = 949,609.50/1,114.80
6. Step 6: Final answer
   x = 851.82