Finding the Fourth Proportional to 105,101.72, 145,043.55 and 59,786.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,101.72 : 145,043.55 = 59,786.20 : x
2. Step 2: Convert to fraction form
   105,101.72/145,043.55 = 59,786.20/x
3. Step 3: Cross multiply
   105,101.72x = 145,043.55 × 59,786.20
4. Step 4: Simplify right side
   105,101.72x = 8,671,601,664.86
5. Step 5: Solve for x
   x = 8,671,601,664.86/105,101.72
6. Step 6: Final answer
   x = 82,506.76