Finding the Fourth Proportional to 105,147.79, 145,106.43 and 57,401.49

Step by Step Solution

1. Step 1: Write the proportion equation
   105,147.79 : 145,106.43 = 57,401.49 : x
2. Step 2: Convert to fraction form
   105,147.79/145,106.43 = 57,401.49/x
3. Step 3: Cross multiply
   105,147.79x = 145,106.43 × 57,401.49
4. Step 4: Simplify right side
   105,147.79x = 8,329,325,290.58
5. Step 5: Solve for x
   x = 8,329,325,290.58/105,147.79
6. Step 6: Final answer
   x = 79,215.41