Finding the Fourth Proportional to 21,886, 30,191.88 and 13,816.06

Step by Step Solution

1. Step 1: Write the proportion equation
   21,886 : 30,191.88 = 13,816.06 : x
2. Step 2: Convert to fraction form
   21,886/30,191.88 = 13,816.06/x
3. Step 3: Cross multiply
   21,886x = 30,191.88 × 13,816.06
4. Step 4: Simplify right side
   21,886x = 417,132,825.59
5. Step 5: Solve for x
   x = 417,132,825.59/21,886
6. Step 6: Final answer
   x = 19,059.35