Finding the Fourth Proportional to 105,411.55, 145,467.49 and 57,013.53

Step by Step Solution

1. Step 1: Write the proportion equation
   105,411.55 : 145,467.49 = 57,013.53 : x
2. Step 2: Convert to fraction form
   105,411.55/145,467.49 = 57,013.53/x
3. Step 3: Cross multiply
   105,411.55x = 145,467.49 × 57,013.53
4. Step 4: Simplify right side
   105,411.55x = 8,293,615,105.14
5. Step 5: Solve for x
   x = 8,293,615,105.14/105,411.55
6. Step 6: Final answer
   x = 78,678.43