Finding the Fourth Proportional to 120,065.31, 165,690.64 and 65,618.59

Step by Step Solution

1. Step 1: Write the proportion equation
   120,065.31 : 165,690.64 = 65,618.59 : x
2. Step 2: Convert to fraction form
   120,065.31/165,690.64 = 65,618.59/x
3. Step 3: Cross multiply
   120,065.31x = 165,690.64 × 65,618.59
4. Step 4: Simplify right side
   120,065.31x = 10,872,386,173.00
5. Step 5: Solve for x
   x = 10,872,386,173.00/120,065.31
6. Step 6: Final answer
   x = 90,553.93