Finding the Fourth Proportional to 23,186.72, 31,947.60 and 15,721.76

Step by Step Solution

1. Step 1: Write the proportion equation
   23,186.72 : 31,947.60 = 15,721.76 : x
2. Step 2: Convert to fraction form
   23,186.72/31,947.60 = 15,721.76/x
3. Step 3: Cross multiply
   23,186.72x = 31,947.60 × 15,721.76
4. Step 4: Simplify right side
   23,186.72x = 502,272,499.78
5. Step 5: Solve for x
   x = 502,272,499.78/23,186.72
6. Step 6: Final answer
   x = 21,662.08