Finding the Fourth Proportional to 31,609.72, 43,630.10 and 19,665.93

Step by Step Solution

1. Step 1: Write the proportion equation
   31,609.72 : 43,630.10 = 19,665.93 : x
2. Step 2: Convert to fraction form
   31,609.72/43,630.10 = 19,665.93/x
3. Step 3: Cross multiply
   31,609.72x = 43,630.10 × 19,665.93
4. Step 4: Simplify right side
   31,609.72x = 858,026,492.49
5. Step 5: Solve for x
   x = 858,026,492.49/31,609.72
6. Step 6: Final answer
   x = 27,144.39