Finding the Fourth Proportional to 105,146.30, 145,104.38 and 57,399.98

Step by Step Solution

1. Step 1: Write the proportion equation
   105,146.30 : 145,104.38 = 57,399.98 : x
2. Step 2: Convert to fraction form
   105,146.30/145,104.38 = 57,399.98/x
3. Step 3: Cross multiply
   105,146.30x = 145,104.38 × 57,399.98
4. Step 4: Simplify right side
   105,146.30x = 8,328,987,712.64
5. Step 5: Solve for x
   x = 8,328,987,712.64/105,146.30
6. Step 6: Final answer
   x = 79,213.32