Finding the Fourth Proportional to 111,978.20, 154,540.82 and 83,634.68

Step by Step Solution

1. Step 1: Write the proportion equation
   111,978.20 : 154,540.82 = 83,634.68 : x
2. Step 2: Convert to fraction form
   111,978.20/154,540.82 = 83,634.68/x
3. Step 3: Cross multiply
   111,978.20x = 154,540.82 × 83,634.68
4. Step 4: Simplify right side
   111,978.20x = 12,924,972,027.64
5. Step 5: Solve for x
   x = 12,924,972,027.64/111,978.20
6. Step 6: Final answer
   x = 115,424.00