Finding the Fourth Proportional to 111,069.50, 166,216.66 and 90,845.21

Step by Step Solution

1. Step 1: Write the proportion equation
   111,069.50 : 166,216.66 = 90,845.21 : x
2. Step 2: Convert to fraction form
   111,069.50/166,216.66 = 90,845.21/x
3. Step 3: Cross multiply
   111,069.50x = 166,216.66 × 90,845.21
4. Step 4: Simplify right side
   111,069.50x = 15,099,987,571.63
5. Step 5: Solve for x
   x = 15,099,987,571.63/111,069.50
6. Step 6: Final answer
   x = 135,950.81