Finding the Fourth Proportional to 111,989.62, 154,539.39 and 64,238.50

Step by Step Solution

1. Step 1: Write the proportion equation
   111,989.62 : 154,539.39 = 64,238.50 : x
2. Step 2: Convert to fraction form
   111,989.62/154,539.39 = 64,238.50/x
3. Step 3: Cross multiply
   111,989.62x = 154,539.39 × 64,238.50
4. Step 4: Simplify right side
   111,989.62x = 9,927,378,604.52
5. Step 5: Solve for x
   x = 9,927,378,604.52/111,989.62
6. Step 6: Final answer
   x = 88,645.52