Finding the Fourth Proportional to 55,782.72, 76,891.68 and 54,676.80

Step by Step Solution

1. Step 1: Write the proportion equation
   55,782.72 : 76,891.68 = 54,676.80 : x
2. Step 2: Convert to fraction form
   55,782.72/76,891.68 = 54,676.80/x
3. Step 3: Cross multiply
   55,782.72x = 76,891.68 × 54,676.80
4. Step 4: Simplify right side
   55,782.72x = 4,204,191,009.02
5. Step 5: Solve for x
   x = 4,204,191,009.02/55,782.72
6. Step 6: Final answer
   x = 75,367.26