Finding the Fourth Proportional to 15,498.81, 21,389.43 and 8,784.48

Step by Step Solution

1. Step 1: Write the proportion equation
   15,498.81 : 21,389.43 = 8,784.48 : x
2. Step 2: Convert to fraction form
   15,498.81/21,389.43 = 8,784.48/x
3. Step 3: Cross multiply
   15,498.81x = 21,389.43 × 8,784.48
4. Step 4: Simplify right side
   15,498.81x = 187,895,133.20
5. Step 5: Solve for x
   x = 187,895,133.20/15,498.81
6. Step 6: Final answer
   x = 12,123.20