Finding the Fourth Proportional to 76,309.43, 105,196.39 and 53,579.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76,309.43 : 105,196.39 = 53,579.21 : x
2. Step 2: Convert to fraction form
   76,309.43/105,196.39 = 53,579.21/x
3. Step 3: Cross multiply
   76,309.43x = 105,196.39 × 53,579.21
4. Step 4: Simplify right side
   76,309.43x = 5,636,338,811.12
5. Step 5: Solve for x
   x = 5,636,338,811.12/76,309.43
6. Step 6: Final answer
   x = 73,861.63