Finding the Fourth Proportional to 105,578.79, 145,697.33 and 57,832.18

Step by Step Solution

1. Step 1: Write the proportion equation
   105,578.79 : 145,697.33 = 57,832.18 : x
2. Step 2: Convert to fraction form
   105,578.79/145,697.33 = 57,832.18/x
3. Step 3: Cross multiply
   105,578.79x = 145,697.33 × 57,832.18
4. Step 4: Simplify right side
   105,578.79x = 8,425,993,994.42
5. Step 5: Solve for x
   x = 8,425,993,994.42/105,578.79
6. Step 6: Final answer
   x = 79,807.64