Finding the Fourth Proportional to 105,589.42, 145,658.16 and 65,290.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,589.42 : 145,658.16 = 65,290.30 : x
2. Step 2: Convert to fraction form
   105,589.42/145,658.16 = 65,290.30/x
3. Step 3: Cross multiply
   105,589.42x = 145,658.16 × 65,290.30
4. Step 4: Simplify right side
   105,589.42x = 9,510,064,963.85
5. Step 5: Solve for x
   x = 9,510,064,963.85/105,589.42
6. Step 6: Final answer
   x = 90,066.46