Finding the Fourth Proportional to 151,831.43, 209,614.83 and 100,913.21

Step by Step Solution

1. Step 1: Write the proportion equation
   151,831.43 : 209,614.83 = 100,913.21 : x
2. Step 2: Convert to fraction form
   151,831.43/209,614.83 = 100,913.21/x
3. Step 3: Cross multiply
   151,831.43x = 209,614.83 × 100,913.21
4. Step 4: Simplify right side
   151,831.43x = 21,152,904,310.83
5. Step 5: Solve for x
   x = 21,152,904,310.83/151,831.43
6. Step 6: Final answer
   x = 139,318.35