Finding the Fourth Proportional to 15,276.72, 21,081.51 and 8,470.71

Step by Step Solution

1. Step 1: Write the proportion equation
   15,276.72 : 21,081.51 = 8,470.71 : x
2. Step 2: Convert to fraction form
   15,276.72/21,081.51 = 8,470.71/x
3. Step 3: Cross multiply
   15,276.72x = 21,081.51 × 8,470.71
4. Step 4: Simplify right side
   15,276.72x = 178,575,389.34
5. Step 5: Solve for x
   x = 178,575,389.34/15,276.72
6. Step 6: Final answer
   x = 11,689.38