Finding the Fourth Proportional to 105,544.49, 145,649.63 and 57,146.03

Step by Step Solution

1. Step 1: Write the proportion equation
   105,544.49 : 145,649.63 = 57,146.03 : x
2. Step 2: Convert to fraction form
   105,544.49/145,649.63 = 57,146.03/x
3. Step 3: Cross multiply
   105,544.49x = 145,649.63 × 57,146.03
4. Step 4: Simplify right side
   105,544.49x = 8,323,297,111.49
5. Step 5: Solve for x
   x = 8,323,297,111.49/105,544.49
6. Step 6: Final answer
   x = 78,860.56