Finding the Fourth Proportional to 21,620.17, 29,835.76 and 12,060.05

Step by Step Solution

1. Step 1: Write the proportion equation
   21,620.17 : 29,835.76 = 12,060.05 : x
2. Step 2: Convert to fraction form
   21,620.17/29,835.76 = 12,060.05/x
3. Step 3: Cross multiply
   21,620.17x = 29,835.76 × 12,060.05
4. Step 4: Simplify right side
   21,620.17x = 359,820,757.39
5. Step 5: Solve for x
   x = 359,820,757.39/21,620.17
6. Step 6: Final answer
   x = 16,642.83