Finding the Fourth Proportional to 31,100.65, 42,918.79 and 17,671.25

Step by Step Solution

1. Step 1: Write the proportion equation
   31,100.65 : 42,918.79 = 17,671.25 : x
2. Step 2: Convert to fraction form
   31,100.65/42,918.79 = 17,671.25/x
3. Step 3: Cross multiply
   31,100.65x = 42,918.79 × 17,671.25
4. Step 4: Simplify right side
   31,100.65x = 758,428,579.43
5. Step 5: Solve for x
   x = 758,428,579.43/31,100.65
6. Step 6: Final answer
   x = 24,386.27