Finding the Fourth Proportional to 86,806.56, 119,805.82 and 54,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   86,806.56 : 119,805.82 = 54,978.42 : x
2. Step 2: Convert to fraction form
   86,806.56/119,805.82 = 54,978.42/x
3. Step 3: Cross multiply
   86,806.56x = 119,805.82 × 54,978.42
4. Step 4: Simplify right side
   86,806.56x = 6,586,734,690.40
5. Step 5: Solve for x
   x = 6,586,734,690.40/86,806.56
6. Step 6: Final answer
   x = 75,878.31