Finding the Fourth Proportional to 120,705.84, 166,673.52 and 78,336.72

Step by Step Solution

1. Step 1: Write the proportion equation
   120,705.84 : 166,673.52 = 78,336.72 : x
2. Step 2: Convert to fraction form
   120,705.84/166,673.52 = 78,336.72/x
3. Step 3: Cross multiply
   120,705.84x = 166,673.52 × 78,336.72
4. Step 4: Simplify right side
   120,705.84x = 13,056,656,867.65
5. Step 5: Solve for x
   x = 13,056,656,867.65/120,705.84
6. Step 6: Final answer
   x = 108,169.22