Finding the Fourth Proportional to 21,709.76, 29,908.32 and 17,908.16

Step by Step Solution

1. Step 1: Write the proportion equation
   21,709.76 : 29,908.32 = 17,908.16 : x
2. Step 2: Convert to fraction form
   21,709.76/29,908.32 = 17,908.16/x
3. Step 3: Cross multiply
   21,709.76x = 29,908.32 × 17,908.16
4. Step 4: Simplify right side
   21,709.76x = 535,602,979.89
5. Step 5: Solve for x
   x = 535,602,979.89/21,709.76
6. Step 6: Final answer
   x = 24,671.07