Finding the Fourth Proportional to 105,567.91, 145,678.91 and 57,820.23

Step by Step Solution

1. Step 1: Write the proportion equation
   105,567.91 : 145,678.91 = 57,820.23 : x
2. Step 2: Convert to fraction form
   105,567.91/145,678.91 = 57,820.23/x
3. Step 3: Cross multiply
   105,567.91x = 145,678.91 × 57,820.23
4. Step 4: Simplify right side
   105,567.91x = 8,423,187,793.25
5. Step 5: Solve for x
   x = 8,423,187,793.25/105,567.91
6. Step 6: Final answer
   x = 79,789.28