Finding the Fourth Proportional to 120,408.69, 166,275.69 and 90,141.48

Step by Step Solution

1. Step 1: Write the proportion equation
   120,408.69 : 166,275.69 = 90,141.48 : x
2. Step 2: Convert to fraction form
   120,408.69/166,275.69 = 90,141.48/x
3. Step 3: Cross multiply
   120,408.69x = 166,275.69 × 90,141.48
4. Step 4: Simplify right side
   120,408.69x = 14,988,336,784.62
5. Step 5: Solve for x
   x = 14,988,336,784.62/120,408.69
6. Step 6: Final answer
   x = 124,478.86