Finding the Fourth Proportional to 120,320.69, 166,041.92 and 65,877.80

Step by Step Solution

1. Step 1: Write the proportion equation
   120,320.69 : 166,041.92 = 65,877.80 : x
2. Step 2: Convert to fraction form
   120,320.69/166,041.92 = 65,877.80/x
3. Step 3: Cross multiply
   120,320.69x = 166,041.92 × 65,877.80
4. Step 4: Simplify right side
   120,320.69x = 10,938,476,397.38
5. Step 5: Solve for x
   x = 10,938,476,397.38/120,320.69
6. Step 6: Final answer
   x = 90,911.02