Finding the Fourth Proportional to 105,393.80, 145,443.48 and 57,651.56

Step by Step Solution

1. Step 1: Write the proportion equation
   105,393.80 : 145,443.48 = 57,651.56 : x
2. Step 2: Convert to fraction form
   105,393.80/145,443.48 = 57,651.56/x
3. Step 3: Cross multiply
   105,393.80x = 145,443.48 × 57,651.56
4. Step 4: Simplify right side
   105,393.80x = 8,385,043,513.83
5. Step 5: Solve for x
   x = 8,385,043,513.83/105,393.80
6. Step 6: Final answer
   x = 79,559.17