Finding the Fourth Proportional to 87,818.67, 131,728.34 and 21,258.69

Step by Step Solution

1. Step 1: Write the proportion equation
   87,818.67 : 131,728.34 = 21,258.69 : x
2. Step 2: Convert to fraction form
   87,818.67/131,728.34 = 21,258.69/x
3. Step 3: Cross multiply
   87,818.67x = 131,728.34 × 21,258.69
4. Step 4: Simplify right side
   87,818.67x = 2,800,371,944.27
5. Step 5: Solve for x
   x = 2,800,371,944.27/87,818.67
6. Step 6: Final answer
   x = 31,888.12