Finding the Fourth Proportional to 65,821.73, 98,742.83 and 21,438.15

Step by Step Solution

1. Step 1: Write the proportion equation
   65,821.73 : 98,742.83 = 21,438.15 : x
2. Step 2: Convert to fraction form
   65,821.73/98,742.83 = 21,438.15/x
3. Step 3: Cross multiply
   65,821.73x = 98,742.83 × 21,438.15
4. Step 4: Simplify right side
   65,821.73x = 2,116,863,493.77
5. Step 5: Solve for x
   x = 2,116,863,493.77/65,821.73
6. Step 6: Final answer
   x = 32,160.56