Finding the Fourth Proportional to 21,522.39, 29,700.72 and 12,090.75

Step by Step Solution

1. Step 1: Write the proportion equation
   21,522.39 : 29,700.72 = 12,090.75 : x
2. Step 2: Convert to fraction form
   21,522.39/29,700.72 = 12,090.75/x
3. Step 3: Cross multiply
   21,522.39x = 29,700.72 × 12,090.75
4. Step 4: Simplify right side
   21,522.39x = 359,103,980.34
5. Step 5: Solve for x
   x = 359,103,980.34/21,522.39
6. Step 6: Final answer
   x = 16,685.13