Finding the Fourth Proportional to 21,521.89, 29,700.03 and 12,090.25

Step by Step Solution

1. Step 1: Write the proportion equation
   21,521.89 : 29,700.03 = 12,090.25 : x
2. Step 2: Convert to fraction form
   21,521.89/29,700.03 = 12,090.25/x
3. Step 3: Cross multiply
   21,521.89x = 29,700.03 × 12,090.25
4. Step 4: Simplify right side
   21,521.89x = 359,080,787.71
5. Step 5: Solve for x
   x = 359,080,787.71/21,521.89
6. Step 6: Final answer
   x = 16,684.44