Finding the Fourth Proportional to 15,499.63, 21,389.43 and 8,426.08

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.63 : 21,389.43 = 8,426.08 : x
2. Step 2: Convert to fraction form
   15,499.63/21,389.43 = 8,426.08/x
3. Step 3: Cross multiply
   15,499.63x = 21,389.43 × 8,426.08
4. Step 4: Simplify right side
   15,499.63x = 180,229,048.33
5. Step 5: Solve for x
   x = 180,229,048.33/15,499.63
6. Step 6: Final answer
   x = 11,627.96