Finding the Fourth Proportional to 21,700.72, 29,947.80 and 12,268.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,700.72 : 29,947.80 = 12,268.72 : x
2. Step 2: Convert to fraction form
   21,700.72/29,947.80 = 12,268.72/x
3. Step 3: Cross multiply
   21,700.72x = 29,947.80 × 12,268.72
4. Step 4: Simplify right side
   21,700.72x = 367,421,172.82
5. Step 5: Solve for x
   x = 367,421,172.82/21,700.72
6. Step 6: Final answer
   x = 16,931.29