Finding the Fourth Proportional to 121,435.29, 167,523.54 and 78,978.33

Step by Step Solution

1. Step 1: Write the proportion equation
   121,435.29 : 167,523.54 = 78,978.33 : x
2. Step 2: Convert to fraction form
   121,435.29/167,523.54 = 78,978.33/x
3. Step 3: Cross multiply
   121,435.29x = 167,523.54 × 78,978.33
4. Step 4: Simplify right side
   121,435.29x = 13,230,729,424.89
5. Step 5: Solve for x
   x = 13,230,729,424.89/121,435.29
6. Step 6: Final answer
   x = 108,952.92