Finding the Fourth Proportional to 19,930.59, 27,504.63 and 10,978.47

Step by Step Solution

1. Step 1: Write the proportion equation
   19,930.59 : 27,504.63 = 10,978.47 : x
2. Step 2: Convert to fraction form
   19,930.59/27,504.63 = 10,978.47/x
3. Step 3: Cross multiply
   19,930.59x = 27,504.63 × 10,978.47
4. Step 4: Simplify right side
   19,930.59x = 301,958,755.32
5. Step 5: Solve for x
   x = 301,958,755.32/19,930.59
6. Step 6: Final answer
   x = 15,150.52