Finding the Fourth Proportional to 21,981, 30,375.18 and 16,665.96

Step by Step Solution

1. Step 1: Write the proportion equation
   21,981 : 30,375.18 = 16,665.96 : x
2. Step 2: Convert to fraction form
   21,981/30,375.18 = 16,665.96/x
3. Step 3: Cross multiply
   21,981x = 30,375.18 × 16,665.96
4. Step 4: Simplify right side
   21,981x = 506,231,534.87
5. Step 5: Solve for x
   x = 506,231,534.87/21,981
6. Step 6: Final answer
   x = 23,030.41