Finding the Fourth Proportional to 111,959.50, 154,509.10 and 66,020.98

Step by Step Solution

1. Step 1: Write the proportion equation
   111,959.50 : 154,509.10 = 66,020.98 : x
2. Step 2: Convert to fraction form
   111,959.50/154,509.10 = 66,020.98/x
3. Step 3: Cross multiply
   111,959.50x = 154,509.10 × 66,020.98
4. Step 4: Simplify right side
   111,959.50x = 10,200,842,200.92
5. Step 5: Solve for x
   x = 10,200,842,200.92/111,959.50
6. Step 6: Final answer
   x = 91,111.89