Finding the Fourth Proportional to 111,105.20, 166,830.60 and 64,449.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111,105.20 : 166,830.60 = 64,449.20 : x
2. Step 2: Convert to fraction form
   111,105.20/166,830.60 = 64,449.20/x
3. Step 3: Cross multiply
   111,105.20x = 166,830.60 × 64,449.20
4. Step 4: Simplify right side
   111,105.20x = 10,752,098,705.52
5. Step 5: Solve for x
   x = 10,752,098,705.52/111,105.20
6. Step 6: Final answer
   x = 96,774.04