Finding the Fourth Proportional to 121,399.69, 181,200.59 and 113,920.15

Step by Step Solution

1. Step 1: Write the proportion equation
   121,399.69 : 181,200.59 = 113,920.15 : x
2. Step 2: Convert to fraction form
   121,399.69/181,200.59 = 113,920.15/x
3. Step 3: Cross multiply
   121,399.69x = 181,200.59 × 113,920.15
4. Step 4: Simplify right side
   121,399.69x = 20,642,398,392.89
5. Step 5: Solve for x
   x = 20,642,398,392.89/121,399.69
6. Step 6: Final answer
   x = 170,036.66