Finding the Fourth Proportional to 19,931.57, 27,504.54 and 10,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.57 : 27,504.54 = 10,978.88 : x
2. Step 2: Convert to fraction form
   19,931.57/27,504.54 = 10,978.88/x
3. Step 3: Cross multiply
   19,931.57x = 27,504.54 × 10,978.88
4. Step 4: Simplify right side
   19,931.57x = 301,969,044.12
5. Step 5: Solve for x
   x = 301,969,044.12/19,931.57
6. Step 6: Final answer
   x = 15,150.29