Finding the Fourth Proportional to 22,980.72, 31,688.28 and 15,515.76

Step by Step Solution

1. Step 1: Write the proportion equation
   22,980.72 : 31,688.28 = 15,515.76 : x
2. Step 2: Convert to fraction form
   22,980.72/31,688.28 = 15,515.76/x
3. Step 3: Cross multiply
   22,980.72x = 31,688.28 × 15,515.76
4. Step 4: Simplify right side
   22,980.72x = 491,667,747.29
5. Step 5: Solve for x
   x = 491,667,747.29/22,980.72
6. Step 6: Final answer
   x = 21,394.79