Finding the Fourth Proportional to 105,431.48, 145,494.15 and 57,684.14

Step by Step Solution

1. Step 1: Write the proportion equation
   105,431.48 : 145,494.15 = 57,684.14 : x
2. Step 2: Convert to fraction form
   105,431.48/145,494.15 = 57,684.14/x
3. Step 3: Cross multiply
   105,431.48x = 145,494.15 × 57,684.14
4. Step 4: Simplify right side
   105,431.48x = 8,392,704,917.78
5. Step 5: Solve for x
   x = 8,392,704,917.78/105,431.48
6. Step 6: Final answer
   x = 79,603.41