Finding the Fourth Proportional to 105,300.34, 145,309.46 and 57,553.73

Step by Step Solution

1. Step 1: Write the proportion equation
   105,300.34 : 145,309.46 = 57,553.73 : x
2. Step 2: Convert to fraction form
   105,300.34/145,309.46 = 57,553.73/x
3. Step 3: Cross multiply
   105,300.34x = 145,309.46 × 57,553.73
4. Step 4: Simplify right side
   105,300.34x = 8,363,101,427.29
5. Step 5: Solve for x
   x = 8,363,101,427.29/105,300.34
6. Step 6: Final answer
   x = 79,421.41