Finding the Fourth Proportional to 131,215.69, 181,164.81 and 100,947.61

Step by Step Solution

1. Step 1: Write the proportion equation
   131,215.69 : 181,164.81 = 100,947.61 : x
2. Step 2: Convert to fraction form
   131,215.69/181,164.81 = 100,947.61/x
3. Step 3: Cross multiply
   131,215.69x = 181,164.81 × 100,947.61
4. Step 4: Simplify right side
   131,215.69x = 18,288,154,585.60
5. Step 5: Solve for x
   x = 18,288,154,585.60/131,215.69
6. Step 6: Final answer
   x = 139,374.75