Finding the Fourth Proportional to 37,019.76, 55,523.88 and 12,390

Step by Step Solution

1. Step 1: Write the proportion equation
   37,019.76 : 55,523.88 = 12,390 : x
2. Step 2: Convert to fraction form
   37,019.76/55,523.88 = 12,390/x
3. Step 3: Cross multiply
   37,019.76x = 55,523.88 × 12,390
4. Step 4: Simplify right side
   37,019.76x = 687,940,873.20
5. Step 5: Solve for x
   x = 687,940,873.20/37,019.76
6. Step 6: Final answer
   x = 18,583.07