Finding the Fourth Proportional to 21,290.05, 29,380.28 and 12,342.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,290.05 : 29,380.28 = 12,342.74 : x
2. Step 2: Convert to fraction form
   21,290.05/29,380.28 = 12,342.74/x
3. Step 3: Cross multiply
   21,290.05x = 29,380.28 × 12,342.74
4. Step 4: Simplify right side
   21,290.05x = 362,633,157.17
5. Step 5: Solve for x
   x = 362,633,157.17/21,290.05
6. Step 6: Final answer
   x = 17,032.99