Finding the Fourth Proportional to 105,499.58, 145,589.68 and 57,756.02

Step by Step Solution

1. Step 1: Write the proportion equation
   105,499.58 : 145,589.68 = 57,756.02 : x
2. Step 2: Convert to fraction form
   105,499.58/145,589.68 = 57,756.02/x
3. Step 3: Cross multiply
   105,499.58x = 145,589.68 × 57,756.02
4. Step 4: Simplify right side
   105,499.58x = 8,408,680,469.87
5. Step 5: Solve for x
   x = 8,408,680,469.87/105,499.58
6. Step 6: Final answer
   x = 79,703.45