Finding the Fourth Proportional to 21,500.57, 29,670.77 and 12,069.15

Step by Step Solution

1. Step 1: Write the proportion equation
   21,500.57 : 29,670.77 = 12,069.15 : x
2. Step 2: Convert to fraction form
   21,500.57/29,670.77 = 12,069.15/x
3. Step 3: Cross multiply
   21,500.57x = 29,670.77 × 12,069.15
4. Step 4: Simplify right side
   21,500.57x = 358,100,913.40
5. Step 5: Solve for x
   x = 358,100,913.40/21,500.57
6. Step 6: Final answer
   x = 16,655.41