Finding the Fourth Proportional to 120,145.81, 165,799.39 and 65,698.16

Step by Step Solution

1. Step 1: Write the proportion equation
   120,145.81 : 165,799.39 = 65,698.16 : x
2. Step 2: Convert to fraction form
   120,145.81/165,799.39 = 65,698.16/x
3. Step 3: Cross multiply
   120,145.81x = 165,799.39 × 65,698.16
4. Step 4: Simplify right side
   120,145.81x = 10,892,714,852.12
5. Step 5: Solve for x
   x = 10,892,714,852.12/120,145.81
6. Step 6: Final answer
   x = 90,662.46