Finding the Fourth Proportional to 21,258.84, 31,890.42 and 5,677.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21,258.84 : 31,890.42 = 5,677.56 : x
2. Step 2: Convert to fraction form
   21,258.84/31,890.42 = 5,677.56/x
3. Step 3: Cross multiply
   21,258.84x = 31,890.42 × 5,677.56
4. Step 4: Simplify right side
   21,258.84x = 181,059,772.98
5. Step 5: Solve for x
   x = 181,059,772.98/21,258.84
6. Step 6: Final answer
   x = 8,516.92