Finding the Fourth Proportional to 67,828.32, 101,759.76 and 21,081.60

Step by Step Solution

1. Step 1: Write the proportion equation
   67,828.32 : 101,759.76 = 21,081.60 : x
2. Step 2: Convert to fraction form
   67,828.32/101,759.76 = 21,081.60/x
3. Step 3: Cross multiply
   67,828.32x = 101,759.76 × 21,081.60
4. Step 4: Simplify right side
   67,828.32x = 2,145,258,556.42
5. Step 5: Solve for x
   x = 2,145,258,556.42/67,828.32
6. Step 6: Final answer
   x = 31,627.77