Finding the Fourth Proportional to 15,443.51, 21,312.90 and 8,729.42

Step by Step Solution

1. Step 1: Write the proportion equation
   15,443.51 : 21,312.90 = 8,729.42 : x
2. Step 2: Convert to fraction form
   15,443.51/21,312.90 = 8,729.42/x
3. Step 3: Cross multiply
   15,443.51x = 21,312.90 × 8,729.42
4. Step 4: Simplify right side
   15,443.51x = 186,049,255.52
5. Step 5: Solve for x
   x = 186,049,255.52/15,443.51
6. Step 6: Final answer
   x = 12,047.08