Finding the Fourth Proportional to 89,105.09, 122,866.50 and 56,788.56

Step by Step Solution

1. Step 1: Write the proportion equation
   89,105.09 : 122,866.50 = 56,788.56 : x
2. Step 2: Convert to fraction form
   89,105.09/122,866.50 = 56,788.56/x
3. Step 3: Cross multiply
   89,105.09x = 122,866.50 × 56,788.56
4. Step 4: Simplify right side
   89,105.09x = 6,977,411,607.24
5. Step 5: Solve for x
   x = 6,977,411,607.24/89,105.09
6. Step 6: Final answer
   x = 78,305.43