Finding the Fourth Proportional to 55,638.27, 76,780.31 and 30,487.77

Step by Step Solution

1. Step 1: Write the proportion equation
   55,638.27 : 76,780.31 = 30,487.77 : x
2. Step 2: Convert to fraction form
   55,638.27/76,780.31 = 30,487.77/x
3. Step 3: Cross multiply
   55,638.27x = 76,780.31 × 30,487.77
4. Step 4: Simplify right side
   55,638.27x = 2,340,860,279.37
5. Step 5: Solve for x
   x = 2,340,860,279.37/55,638.27
6. Step 6: Final answer
   x = 42,072.84