Finding the Fourth Proportional to 19,930.79, 27,504.05 and 10,978.08

Step by Step Solution

1. Step 1: Write the proportion equation
   19,930.79 : 27,504.05 = 10,978.08 : x
2. Step 2: Convert to fraction form
   19,930.79/27,504.05 = 10,978.08/x
3. Step 3: Cross multiply
   19,930.79x = 27,504.05 × 10,978.08
4. Step 4: Simplify right side
   19,930.79x = 301,941,606.33
5. Step 5: Solve for x
   x = 301,941,606.33/19,930.79
6. Step 6: Final answer
   x = 15,149.51