Finding the Fourth Proportional to 89,566.76, 123,579.78 and 57,697.31

Step by Step Solution

1. Step 1: Write the proportion equation
   89,566.76 : 123,579.78 = 57,697.31 : x
2. Step 2: Convert to fraction form
   89,566.76/123,579.78 = 57,697.31/x
3. Step 3: Cross multiply
   89,566.76x = 123,579.78 × 57,697.31
4. Step 4: Simplify right side
   89,566.76x = 7,130,220,968.98
5. Step 5: Solve for x
   x = 7,130,220,968.98/89,566.76
6. Step 6: Final answer
   x = 79,607.89