Finding the Fourth Proportional to 105,196.62, 145,164.96 and 57,440.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,196.62 : 145,164.96 = 57,440.28 : x
2. Step 2: Convert to fraction form
   105,196.62/145,164.96 = 57,440.28/x
3. Step 3: Cross multiply
   105,196.62x = 145,164.96 × 57,440.28
4. Step 4: Simplify right side
   105,196.62x = 8,338,315,948.59
5. Step 5: Solve for x
   x = 8,338,315,948.59/105,196.62
6. Step 6: Final answer
   x = 79,264.11