Finding the Fourth Proportional to 105,499.85, 145,591.16 and 57,752.15

Step by Step Solution

1. Step 1: Write the proportion equation
   105,499.85 : 145,591.16 = 57,752.15 : x
2. Step 2: Convert to fraction form
   105,499.85/145,591.16 = 57,752.15/x
3. Step 3: Cross multiply
   105,499.85x = 145,591.16 × 57,752.15
4. Step 4: Simplify right side
   105,499.85x = 8,408,201,494.28
5. Step 5: Solve for x
   x = 8,408,201,494.28/105,499.85
6. Step 6: Final answer
   x = 79,698.71