Finding the Fourth Proportional to 21,538.32, 29,725.55 and 12,106.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21,538.32 : 29,725.55 = 12,106.88 : x
2. Step 2: Convert to fraction form
   21,538.32/29,725.55 = 12,106.88/x
3. Step 3: Cross multiply
   21,538.32x = 29,725.55 × 12,106.88
4. Step 4: Simplify right side
   21,538.32x = 359,883,666.78
5. Step 5: Solve for x
   x = 359,883,666.78/21,538.32
6. Step 6: Final answer
   x = 16,708.99