Finding the Fourth Proportional to 15,731.89, 21,709.56 and 8,927.15

Step by Step Solution

1. Step 1: Write the proportion equation
   15,731.89 : 21,709.56 = 8,927.15 : x
2. Step 2: Convert to fraction form
   15,731.89/21,709.56 = 8,927.15/x
3. Step 3: Cross multiply
   15,731.89x = 21,709.56 × 8,927.15
4. Step 4: Simplify right side
   15,731.89x = 193,804,498.55
5. Step 5: Solve for x
   x = 193,804,498.55/15,731.89
6. Step 6: Final answer
   x = 12,319.21