Finding the Fourth Proportional to 105,669.88, 145,839.35 and 65,396.61

Step by Step Solution

1. Step 1: Write the proportion equation
   105,669.88 : 145,839.35 = 65,396.61 : x
2. Step 2: Convert to fraction form
   105,669.88/145,839.35 = 65,396.61/x
3. Step 3: Cross multiply
   105,669.88x = 145,839.35 × 65,396.61
4. Step 4: Simplify right side
   105,669.88x = 9,537,399,094.60
5. Step 5: Solve for x
   x = 9,537,399,094.60/105,669.88
6. Step 6: Final answer
   x = 90,256.55