Finding the Fourth Proportional to 21,827.90, 30,126.15 and 12,877.62

Step by Step Solution

1. Step 1: Write the proportion equation
   21,827.90 : 30,126.15 = 12,877.62 : x
2. Step 2: Convert to fraction form
   21,827.90/30,126.15 = 12,877.62/x
3. Step 3: Cross multiply
   21,827.90x = 30,126.15 × 12,877.62
4. Step 4: Simplify right side
   21,827.90x = 387,953,111.76
5. Step 5: Solve for x
   x = 387,953,111.76/21,827.90
6. Step 6: Final answer
   x = 17,773.27