Finding the Fourth Proportional to 120,435.15, 166,200.42 and 65,987.37

Step by Step Solution

1. Step 1: Write the proportion equation
   120,435.15 : 166,200.42 = 65,987.37 : x
2. Step 2: Convert to fraction form
   120,435.15/166,200.42 = 65,987.37/x
3. Step 3: Cross multiply
   120,435.15x = 166,200.42 × 65,987.37
4. Step 4: Simplify right side
   120,435.15x = 10,967,128,608.70
5. Step 5: Solve for x
   x = 10,967,128,608.70/120,435.15
6. Step 6: Final answer
   x = 91,062.52