Finding the Fourth Proportional to 76,487.22, 105,522.89 and 56,391.80

Step by Step Solution

1. Step 1: Write the proportion equation
   76,487.22 : 105,522.89 = 56,391.80 : x
2. Step 2: Convert to fraction form
   76,487.22/105,522.89 = 56,391.80/x
3. Step 3: Cross multiply
   76,487.22x = 105,522.89 × 56,391.80
4. Step 4: Simplify right side
   76,487.22x = 5,950,624,898.73
5. Step 5: Solve for x
   x = 5,950,624,898.73/76,487.22
6. Step 6: Final answer
   x = 77,798.94