Finding the Fourth Proportional to 57,831.72, 86,748.18 and 20,384.81

Step by Step Solution

1. Step 1: Write the proportion equation
   57,831.72 : 86,748.18 = 20,384.81 : x
2. Step 2: Convert to fraction form
   57,831.72/86,748.18 = 20,384.81/x
3. Step 3: Cross multiply
   57,831.72x = 86,748.18 × 20,384.81
4. Step 4: Simplify right side
   57,831.72x = 1,768,345,167.15
5. Step 5: Solve for x
   x = 1,768,345,167.15/57,831.72
6. Step 6: Final answer
   x = 30,577.43