Finding the Fourth Proportional to 105,196.68, 145,170.68 and 57,450.04

Step by Step Solution

1. Step 1: Write the proportion equation
   105,196.68 : 145,170.68 = 57,450.04 : x
2. Step 2: Convert to fraction form
   105,196.68/145,170.68 = 57,450.04/x
3. Step 3: Cross multiply
   105,196.68x = 145,170.68 × 57,450.04
4. Step 4: Simplify right side
   105,196.68x = 8,340,061,372.83
5. Step 5: Solve for x
   x = 8,340,061,372.83/105,196.68
6. Step 6: Final answer
   x = 79,280.65