Finding the Fourth Proportional to 19,931.05, 27,504.87 and 10,978.57

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.05 : 27,504.87 = 10,978.57 : x
2. Step 2: Convert to fraction form
   19,931.05/27,504.87 = 10,978.57/x
3. Step 3: Cross multiply
   19,931.05x = 27,504.87 × 10,978.57
4. Step 4: Simplify right side
   19,931.05x = 301,964,140.64
5. Step 5: Solve for x
   x = 301,964,140.64/19,931.05
6. Step 6: Final answer
   x = 15,150.44