Finding the Fourth Proportional to 105,083.28, 145,012.12 and 57,336.60

Step by Step Solution

1. Step 1: Write the proportion equation
   105,083.28 : 145,012.12 = 57,336.60 : x
2. Step 2: Convert to fraction form
   105,083.28/145,012.12 = 57,336.60/x
3. Step 3: Cross multiply
   105,083.28x = 145,012.12 × 57,336.60
4. Step 4: Simplify right side
   105,083.28x = 8,314,501,919.59
5. Step 5: Solve for x
   x = 8,314,501,919.59/105,083.28
6. Step 6: Final answer
   x = 79,122.98