Finding the Fourth Proportional to 65,456.16, 98,199.96 and 21,087.12

Step by Step Solution

1. Step 1: Write the proportion equation
   65,456.16 : 98,199.96 = 21,087.12 : x
2. Step 2: Convert to fraction form
   65,456.16/98,199.96 = 21,087.12/x
3. Step 3: Cross multiply
   65,456.16x = 98,199.96 × 21,087.12
4. Step 4: Simplify right side
   65,456.16x = 2,070,754,340.52
5. Step 5: Solve for x
   x = 2,070,754,340.52/65,456.16
6. Step 6: Final answer
   x = 31,635.74