Finding the Fourth Proportional to 21,910.86, 30,242.70 and 13,522.50

Step by Step Solution

1. Step 1: Write the proportion equation
   21,910.86 : 30,242.70 = 13,522.50 : x
2. Step 2: Convert to fraction form
   21,910.86/30,242.70 = 13,522.50/x
3. Step 3: Cross multiply
   21,910.86x = 30,242.70 × 13,522.50
4. Step 4: Simplify right side
   21,910.86x = 408,956,910.75
5. Step 5: Solve for x
   x = 408,956,910.75/21,910.86
6. Step 6: Final answer
   x = 18,664.58