Finding the Fourth Proportional to 105,142.35, 145,099.85 and 59,819.21

Step by Step Solution

1. Step 1: Write the proportion equation
   105,142.35 : 145,099.85 = 59,819.21 : x
2. Step 2: Convert to fraction form
   105,142.35/145,099.85 = 59,819.21/x
3. Step 3: Cross multiply
   105,142.35x = 145,099.85 × 59,819.21
4. Step 4: Simplify right side
   105,142.35x = 8,679,757,373.52
5. Step 5: Solve for x
   x = 8,679,757,373.52/105,142.35
6. Step 6: Final answer
   x = 82,552.44