Finding the Fourth Proportional to 105,221.05, 145,200.83 and 57,476.09

Step by Step Solution

1. Step 1: Write the proportion equation
   105,221.05 : 145,200.83 = 57,476.09 : x
2. Step 2: Convert to fraction form
   105,221.05/145,200.83 = 57,476.09/x
3. Step 3: Cross multiply
   105,221.05x = 145,200.83 × 57,476.09
4. Step 4: Simplify right side
   105,221.05x = 8,345,576,048.78
5. Step 5: Solve for x
   x = 8,345,576,048.78/105,221.05
6. Step 6: Final answer
   x = 79,314.70