Finding the Fourth Proportional to 21,090.72, 29,102.72 and 11,659.36

Step by Step Solution

1. Step 1: Write the proportion equation
   21,090.72 : 29,102.72 = 11,659.36 : x
2. Step 2: Convert to fraction form
   21,090.72/29,102.72 = 11,659.36/x
3. Step 3: Cross multiply
   21,090.72x = 29,102.72 × 11,659.36
4. Step 4: Simplify right side
   21,090.72x = 339,319,089.46
5. Step 5: Solve for x
   x = 339,319,089.46/21,090.72
6. Step 6: Final answer
   x = 16,088.55