Finding the Fourth Proportional to 105,150.56, 145,109.88 and 57,404.09

Step by Step Solution

1. Step 1: Write the proportion equation
   105,150.56 : 145,109.88 = 57,404.09 : x
2. Step 2: Convert to fraction form
   105,150.56/145,109.88 = 57,404.09/x
3. Step 3: Cross multiply
   105,150.56x = 145,109.88 × 57,404.09
4. Step 4: Simplify right side
   105,150.56x = 8,329,900,974.18
5. Step 5: Solve for x
   x = 8,329,900,974.18/105,150.56
6. Step 6: Final answer
   x = 79,218.80