Finding the Fourth Proportional to 57,715.10, 86,561.71 and 20,266.37

Step by Step Solution

1. Step 1: Write the proportion equation
   57,715.10 : 86,561.71 = 20,266.37 : x
2. Step 2: Convert to fraction form
   57,715.10/86,561.71 = 20,266.37/x
3. Step 3: Cross multiply
   57,715.10x = 86,561.71 × 20,266.37
4. Step 4: Simplify right side
   57,715.10x = 1,754,291,642.69
5. Step 5: Solve for x
   x = 1,754,291,642.69/57,715.10
6. Step 6: Final answer
   x = 30,395.71