Finding the Fourth Proportional to 21,801.61, 30,085.18 and 12,369.97

Step by Step Solution

1. Step 1: Write the proportion equation
   21,801.61 : 30,085.18 = 12,369.97 : x
2. Step 2: Convert to fraction form
   21,801.61/30,085.18 = 12,369.97/x
3. Step 3: Cross multiply
   21,801.61x = 30,085.18 × 12,369.97
4. Step 4: Simplify right side
   21,801.61x = 372,152,774.04
5. Step 5: Solve for x
   x = 372,152,774.04/21,801.61
6. Step 6: Final answer
   x = 17,069.97