Finding the Fourth Proportional to 19,931.38, 27,504.63 and 10,978.87

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.38 : 27,504.63 = 10,978.87 : x
2. Step 2: Convert to fraction form
   19,931.38/27,504.63 = 10,978.87/x
3. Step 3: Cross multiply
   19,931.38x = 27,504.63 × 10,978.87
4. Step 4: Simplify right side
   19,931.38x = 301,969,757.17
5. Step 5: Solve for x
   x = 301,969,757.17/19,931.38
6. Step 6: Final answer
   x = 15,150.47