Finding the Fourth Proportional to 31,491.72, 47,208.42 and 17,631

Step by Step Solution

1. Step 1: Write the proportion equation
   31,491.72 : 47,208.42 = 17,631 : x
2. Step 2: Convert to fraction form
   31,491.72/47,208.42 = 17,631/x
3. Step 3: Cross multiply
   31,491.72x = 47,208.42 × 17,631
4. Step 4: Simplify right side
   31,491.72x = 832,331,653.02
5. Step 5: Solve for x
   x = 832,331,653.02/31,491.72
6. Step 6: Final answer
   x = 26,430.17