Finding the Fourth Proportional to 15,499.22, 21,389.38 and 8,784.63

Step by Step Solution

1. Step 1: Write the proportion equation
   15,499.22 : 21,389.38 = 8,784.63 : x
2. Step 2: Convert to fraction form
   15,499.22/21,389.38 = 8,784.63/x
3. Step 3: Cross multiply
   15,499.22x = 21,389.38 × 8,784.63
4. Step 4: Simplify right side
   15,499.22x = 187,897,789.23
5. Step 5: Solve for x
   x = 187,897,789.23/15,499.22
6. Step 6: Final answer
   x = 12,123.05