Finding the Fourth Proportional to 105,709.86, 145,878.37 and 57,962.79

Step by Step Solution

1. Step 1: Write the proportion equation
   105,709.86 : 145,878.37 = 57,962.79 : x
2. Step 2: Convert to fraction form
   105,709.86/145,878.37 = 57,962.79/x
3. Step 3: Cross multiply
   105,709.86x = 145,878.37 × 57,962.79
4. Step 4: Simplify right side
   105,709.86x = 8,455,517,180.95
5. Step 5: Solve for x
   x = 8,455,517,180.95/105,709.86
6. Step 6: Final answer
   x = 79,987.97