Finding the Fourth Proportional to 21,710.72, 29,962.40 and 12,151.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,710.72 : 29,962.40 = 12,151.57 : x
2. Step 2: Convert to fraction form
   21,710.72/29,962.40 = 12,151.57/x
3. Step 3: Cross multiply
   21,710.72x = 29,962.40 × 12,151.57
4. Step 4: Simplify right side
   21,710.72x = 364,090,200.97
5. Step 5: Solve for x
   x = 364,090,200.97/21,710.72
6. Step 6: Final answer
   x = 16,770.07