Finding the Fourth Proportional to 19,931.32, 27,504.20 and 10,978.63

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.32 : 27,504.20 = 10,978.63 : x
2. Step 2: Convert to fraction form
   19,931.32/27,504.20 = 10,978.63/x
3. Step 3: Cross multiply
   19,931.32x = 27,504.20 × 10,978.63
4. Step 4: Simplify right side
   19,931.32x = 301,958,297.73
5. Step 5: Solve for x
   x = 301,958,297.73/19,931.32
6. Step 6: Final answer
   x = 15,149.94