Finding the Fourth Proportional to 55,789.30, 76,989.78 and 30,638.80

Step by Step Solution

1. Step 1: Write the proportion equation
   55,789.30 : 76,989.78 = 30,638.80 : x
2. Step 2: Convert to fraction form
   55,789.30/76,989.78 = 30,638.80/x
3. Step 3: Cross multiply
   55,789.30x = 76,989.78 × 30,638.80
4. Step 4: Simplify right side
   55,789.30x = 2,358,873,933.32
5. Step 5: Solve for x
   x = 2,358,873,933.32/55,789.30
6. Step 6: Final answer
   x = 42,281.84