Finding the Fourth Proportional to 55,578.72, 76,698.64 and 30,428.22

Step by Step Solution

1. Step 1: Write the proportion equation
   55,578.72 : 76,698.64 = 30,428.22 : x
2. Step 2: Convert to fraction form
   55,578.72/76,698.64 = 30,428.22/x
3. Step 3: Cross multiply
   55,578.72x = 76,698.64 × 30,428.22
4. Step 4: Simplify right side
   55,578.72x = 2,333,803,091.62
5. Step 5: Solve for x
   x = 2,333,803,091.62/55,578.72
6. Step 6: Final answer
   x = 41,990.95