Finding the Fourth Proportional to 121,411.56, 167,574.78 and 78,896.28

Step by Step Solution

1. Step 1: Write the proportion equation
   121,411.56 : 167,574.78 = 78,896.28 : x
2. Step 2: Convert to fraction form
   121,411.56/167,574.78 = 78,896.28/x
3. Step 3: Cross multiply
   121,411.56x = 167,574.78 × 78,896.28
4. Step 4: Simplify right side
   121,411.56x = 13,221,026,763.82
5. Step 5: Solve for x
   x = 13,221,026,763.82/121,411.56
6. Step 6: Final answer
   x = 108,894.30