Finding the Fourth Proportional to 37,638.62, 56,460.72 and 12,678.56

Step by Step Solution

1. Step 1: Write the proportion equation
   37,638.62 : 56,460.72 = 12,678.56 : x
2. Step 2: Convert to fraction form
   37,638.62/56,460.72 = 12,678.56/x
3. Step 3: Cross multiply
   37,638.62x = 56,460.72 × 12,678.56
4. Step 4: Simplify right side
   37,638.62x = 715,840,626.16
5. Step 5: Solve for x
   x = 715,840,626.16/37,638.62
6. Step 6: Final answer
   x = 19,018.78