Finding the Fourth Proportional to 12,354,128.72, 18,530,930.64 and 3,378,680.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,354,128.72 : 18,530,930.64 = 3,378,680.72 : x
2. Step 2: Convert to fraction form
   12,354,128.72/18,530,930.64 = 3,378,680.72/x
3. Step 3: Cross multiply
   12,354,128.72x = 18,530,930.64 × 3,378,680.72
4. Step 4: Simplify right side
   12,354,128.72x = 62,610,098,077,025.27
5. Step 5: Solve for x
   x = 62,610,098,077,025.27/12,354,128.72
6. Step 6: Final answer
   x = 5,067,949.31