Finding the Fourth Proportional to 21,776.84, 30,051.15 and 12,824.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,776.84 : 30,051.15 = 12,824.72 : x
2. Step 2: Convert to fraction form
   21,776.84/30,051.15 = 12,824.72/x
3. Step 3: Cross multiply
   21,776.84x = 30,051.15 × 12,824.72
4. Step 4: Simplify right side
   21,776.84x = 385,397,434.17
5. Step 5: Solve for x
   x = 385,397,434.17/21,776.84
6. Step 6: Final answer
   x = 17,697.59