Finding the Fourth Proportional to 2,085.12, 3,127.23 and 623.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.12 : 3,127.23 = 623.88 : x
2. Step 2: Convert to fraction form
   2,085.12/3,127.23 = 623.88/x
3. Step 3: Cross multiply
   2,085.12x = 3,127.23 × 623.88
4. Step 4: Simplify right side
   2,085.12x = 1,951,016.25
5. Step 5: Solve for x
   x = 1,951,016.25/2,085.12
6. Step 6: Final answer
   x = 935.69