Finding the Fourth Proportional to 21,784.86, 30,061.35 and 12,354.30

Step by Step Solution

1. Step 1: Write the proportion equation
   21,784.86 : 30,061.35 = 12,354.30 : x
2. Step 2: Convert to fraction form
   21,784.86/30,061.35 = 12,354.30/x
3. Step 3: Cross multiply
   21,784.86x = 30,061.35 × 12,354.30
4. Step 4: Simplify right side
   21,784.86x = 371,386,936.31
5. Step 5: Solve for x
   x = 371,386,936.31/21,784.86
6. Step 6: Final answer
   x = 17,047.94