Finding the Fourth Proportional to 120,142.58, 165,793.82 and 66,426.21

Step by Step Solution

1. Step 1: Write the proportion equation
   120,142.58 : 165,793.82 = 66,426.21 : x
2. Step 2: Convert to fraction form
   120,142.58/165,793.82 = 66,426.21/x
3. Step 3: Cross multiply
   120,142.58x = 165,793.82 × 66,426.21
4. Step 4: Simplify right side
   120,142.58x = 11,013,054,771.89
5. Step 5: Solve for x
   x = 11,013,054,771.89/120,142.58
6. Step 6: Final answer
   x = 91,666.55