Finding the Fourth Proportional to 12,276.72, 18,415.20 and 3,042.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,276.72 : 18,415.20 = 3,042.72 : x
2. Step 2: Convert to fraction form
   12,276.72/18,415.20 = 3,042.72/x
3. Step 3: Cross multiply
   12,276.72x = 18,415.20 × 3,042.72
4. Step 4: Simplify right side
   12,276.72x = 56,032,297.34
5. Step 5: Solve for x
   x = 56,032,297.34/12,276.72
6. Step 6: Final answer
   x = 4,564.11