Finding the Fourth Proportional to 65,805.50, 98,718.52 and 21,421.78

Step by Step Solution

1. Step 1: Write the proportion equation
   65,805.50 : 98,718.52 = 21,421.78 : x
2. Step 2: Convert to fraction form
   65,805.50/98,718.52 = 21,421.78/x
3. Step 3: Cross multiply
   65,805.50x = 98,718.52 × 21,421.78
4. Step 4: Simplify right side
   65,805.50x = 2,114,726,417.37
5. Step 5: Solve for x
   x = 2,114,726,417.37/65,805.50
6. Step 6: Final answer
   x = 32,136.01