Finding the Fourth Proportional to 40,898.72, 56,459.23 and 30,831.23

Step by Step Solution

1. Step 1: Write the proportion equation
   40,898.72 : 56,459.23 = 30,831.23 : x
2. Step 2: Convert to fraction form
   40,898.72/56,459.23 = 30,831.23/x
3. Step 3: Cross multiply
   40,898.72x = 56,459.23 × 30,831.23
4. Step 4: Simplify right side
   40,898.72x = 1,740,707,569.82
5. Step 5: Solve for x
   x = 1,740,707,569.82/40,898.72
6. Step 6: Final answer
   x = 42,561.42