Finding the Fourth Proportional to 105,120.54, 145,066.86 and 57,375

Step by Step Solution

1. Step 1: Write the proportion equation
   105,120.54 : 145,066.86 = 57,375 : x
2. Step 2: Convert to fraction form
   105,120.54/145,066.86 = 57,375/x
3. Step 3: Cross multiply
   105,120.54x = 145,066.86 × 57,375
4. Step 4: Simplify right side
   105,120.54x = 8,323,211,092.50
5. Step 5: Solve for x
   x = 8,323,211,092.50/105,120.54
6. Step 6: Final answer
   x = 79,177.78