Finding the Fourth Proportional to 65,790.84, 98,660.52 and 21,406.80

Step by Step Solution

1. Step 1: Write the proportion equation
   65,790.84 : 98,660.52 = 21,406.80 : x
2. Step 2: Convert to fraction form
   65,790.84/98,660.52 = 21,406.80/x
3. Step 3: Cross multiply
   65,790.84x = 98,660.52 × 21,406.80
4. Step 4: Simplify right side
   65,790.84x = 2,112,006,019.54
5. Step 5: Solve for x
   x = 2,112,006,019.54/65,790.84
6. Step 6: Final answer
   x = 32,101.82