Finding the Fourth Proportional to 37,017.76, 55,515.12 and 12,388

Step by Step Solution

1. Step 1: Write the proportion equation
   37,017.76 : 55,515.12 = 12,388 : x
2. Step 2: Convert to fraction form
   37,017.76/55,515.12 = 12,388/x
3. Step 3: Cross multiply
   37,017.76x = 55,515.12 × 12,388
4. Step 4: Simplify right side
   37,017.76x = 687,721,306.56
5. Step 5: Solve for x
   x = 687,721,306.56/37,017.76
6. Step 6: Final answer
   x = 18,578.14