Finding the Fourth Proportional to 105,138.98, 145,093.83 and 57,396.50

Step by Step Solution

1. Step 1: Write the proportion equation
   105,138.98 : 145,093.83 = 57,396.50 : x
2. Step 2: Convert to fraction form
   105,138.98/145,093.83 = 57,396.50/x
3. Step 3: Cross multiply
   105,138.98x = 145,093.83 × 57,396.50
4. Step 4: Simplify right side
   105,138.98x = 8,327,878,013.60
5. Step 5: Solve for x
   x = 8,327,878,013.60/105,138.98
6. Step 6: Final answer
   x = 79,208.28