Finding the Fourth Proportional to 105,101.10, 145,039.92 and 57,355.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,101.10 : 145,039.92 = 57,355.50 : x
2. Step 2: Convert to fraction form
   105,101.10/145,039.92 = 57,355.50/x
3. Step 3: Cross multiply
   105,101.10x = 145,039.92 × 57,355.50
4. Step 4: Simplify right side
   105,101.10x = 8,318,837,131.56
5. Step 5: Solve for x
   x = 8,318,837,131.56/105,101.10
6. Step 6: Final answer
   x = 79,150.81