Finding the Fourth Proportional to 31,290.72, 43,181.55 and 17,143.80

Step by Step Solution

1. Step 1: Write the proportion equation
   31,290.72 : 43,181.55 = 17,143.80 : x
2. Step 2: Convert to fraction form
   31,290.72/43,181.55 = 17,143.80/x
3. Step 3: Cross multiply
   31,290.72x = 43,181.55 × 17,143.80
4. Step 4: Simplify right side
   31,290.72x = 740,295,856.89
5. Step 5: Solve for x
   x = 740,295,856.89/31,290.72
6. Step 6: Final answer
   x = 23,658.64