Finding the Fourth Proportional to 105,209.69, 145,192.50 and 57,463.83

Step by Step Solution

1. Step 1: Write the proportion equation
   105,209.69 : 145,192.50 = 57,463.83 : x
2. Step 2: Convert to fraction form
   105,209.69/145,192.50 = 57,463.83/x
3. Step 3: Cross multiply
   105,209.69x = 145,192.50 × 57,463.83
4. Step 4: Simplify right side
   105,209.69x = 8,343,317,137.28
5. Step 5: Solve for x
   x = 8,343,317,137.28/105,209.69
6. Step 6: Final answer
   x = 79,301.80