Finding the Fourth Proportional to 105,447.36, 145,525.98 and 60,139.59

Step by Step Solution

1. Step 1: Write the proportion equation
   105,447.36 : 145,525.98 = 60,139.59 : x
2. Step 2: Convert to fraction form
   105,447.36/145,525.98 = 60,139.59/x
3. Step 3: Cross multiply
   105,447.36x = 145,525.98 × 60,139.59
4. Step 4: Simplify right side
   105,447.36x = 8,751,872,771.55
5. Step 5: Solve for x
   x = 8,751,872,771.55/105,447.36
6. Step 6: Final answer
   x = 82,997.55