Finding the Fourth Proportional to 65,389.23, 98,087.37 and 21,012.57

Step by Step Solution

1. Step 1: Write the proportion equation
   65,389.23 : 98,087.37 = 21,012.57 : x
2. Step 2: Convert to fraction form
   65,389.23/98,087.37 = 21,012.57/x
3. Step 3: Cross multiply
   65,389.23x = 98,087.37 × 21,012.57
4. Step 4: Simplify right side
   65,389.23x = 2,061,067,728.24
5. Step 5: Solve for x
   x = 2,061,067,728.24/65,389.23
6. Step 6: Final answer
   x = 31,519.99