Finding the Fourth Proportional to 105,684.32, 145,846.24 and 57,287.83

Step by Step Solution

1. Step 1: Write the proportion equation
   105,684.32 : 145,846.24 = 57,287.83 : x
2. Step 2: Convert to fraction form
   105,684.32/145,846.24 = 57,287.83/x
3. Step 3: Cross multiply
   105,684.32x = 145,846.24 × 57,287.83
4. Step 4: Simplify right side
   105,684.32x = 8,355,214,095.42
5. Step 5: Solve for x
   x = 8,355,214,095.42/105,684.32
6. Step 6: Final answer
   x = 79,058.22