Finding the Fourth Proportional to 21,821.10, 30,117.88 and 13,861.78

Step by Step Solution

1. Step 1: Write the proportion equation
   21,821.10 : 30,117.88 = 13,861.78 : x
2. Step 2: Convert to fraction form
   21,821.10/30,117.88 = 13,861.78/x
3. Step 3: Cross multiply
   21,821.10x = 30,117.88 × 13,861.78
4. Step 4: Simplify right side
   21,821.10x = 417,487,460.10
5. Step 5: Solve for x
   x = 417,487,460.10/21,821.10
6. Step 6: Final answer
   x = 19,132.29