Finding the Fourth Proportional to 105,422.74, 145,480.89 and 57,676.48

Step by Step Solution

1. Step 1: Write the proportion equation
   105,422.74 : 145,480.89 = 57,676.48 : x
2. Step 2: Convert to fraction form
   105,422.74/145,480.89 = 57,676.48/x
3. Step 3: Cross multiply
   105,422.74x = 145,480.89 × 57,676.48
4. Step 4: Simplify right side
   105,422.74x = 8,390,825,608.03
5. Step 5: Solve for x
   x = 8,390,825,608.03/105,422.74
6. Step 6: Final answer
   x = 79,592.18