Finding the Fourth Proportional to 90,011.53, 135,036.42 and 30,831.31

Step by Step Solution

1. Step 1: Write the proportion equation
   90,011.53 : 135,036.42 = 30,831.31 : x
2. Step 2: Convert to fraction form
   90,011.53/135,036.42 = 30,831.31/x
3. Step 3: Cross multiply
   90,011.53x = 135,036.42 × 30,831.31
4. Step 4: Simplify right side
   90,011.53x = 4,163,349,726.31
5. Step 5: Solve for x
   x = 4,163,349,726.31/90,011.53
6. Step 6: Final answer
   x = 46,253.52