Finding the Fourth Proportional to 21,190.48, 29,242.72 and 12,238.76

Step by Step Solution

1. Step 1: Write the proportion equation
   21,190.48 : 29,242.72 = 12,238.76 : x
2. Step 2: Convert to fraction form
   21,190.48/29,242.72 = 12,238.76/x
3. Step 3: Cross multiply
   21,190.48x = 29,242.72 × 12,238.76
4. Step 4: Simplify right side
   21,190.48x = 357,894,631.83
5. Step 5: Solve for x
   x = 357,894,631.83/21,190.48
6. Step 6: Final answer
   x = 16,889.41