Finding the Fourth Proportional to 21,817, 30,107.52 and 12,387.04

Step by Step Solution

1. Step 1: Write the proportion equation
   21,817 : 30,107.52 = 12,387.04 : x
2. Step 2: Convert to fraction form
   21,817/30,107.52 = 12,387.04/x
3. Step 3: Cross multiply
   21,817x = 30,107.52 × 12,387.04
4. Step 4: Simplify right side
   21,817x = 372,943,054.54
5. Step 5: Solve for x
   x = 372,943,054.54/21,817
6. Step 6: Final answer
   x = 17,094.15