Finding the Fourth Proportional to 105,588.42, 145,656.78 and 65,289.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,588.42 : 145,656.78 = 65,289.30 : x
2. Step 2: Convert to fraction form
   105,588.42/145,656.78 = 65,289.30/x
3. Step 3: Cross multiply
   105,588.42x = 145,656.78 × 65,289.30
4. Step 4: Simplify right side
   105,588.42x = 9,509,829,206.45
5. Step 5: Solve for x
   x = 9,509,829,206.45/105,588.42
6. Step 6: Final answer
   x = 90,065.08