Finding the Fourth Proportional to 111,788.69, 154,214.15 and 66,434.54

Step by Step Solution

1. Step 1: Write the proportion equation
   111,788.69 : 154,214.15 = 66,434.54 : x
2. Step 2: Convert to fraction form
   111,788.69/154,214.15 = 66,434.54/x
3. Step 3: Cross multiply
   111,788.69x = 154,214.15 × 66,434.54
4. Step 4: Simplify right side
   111,788.69x = 10,245,145,013.50
5. Step 5: Solve for x
   x = 10,245,145,013.50/111,788.69
6. Step 6: Final answer
   x = 91,647.42