Finding the Fourth Proportional to 31,345.29, 47,018.24 and 7,971.72

Step by Step Solution

1. Step 1: Write the proportion equation
   31,345.29 : 47,018.24 = 7,971.72 : x
2. Step 2: Convert to fraction form
   31,345.29/47,018.24 = 7,971.72/x
3. Step 3: Cross multiply
   31,345.29x = 47,018.24 × 7,971.72
4. Step 4: Simplify right side
   31,345.29x = 374,816,204.31
5. Step 5: Solve for x
   x = 374,816,204.31/31,345.29
6. Step 6: Final answer
   x = 11,957.66