Finding the Fourth Proportional to 19,931.39, 27,505.35 and 10,978.92

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.39 : 27,505.35 = 10,978.92 : x
2. Step 2: Convert to fraction form
   19,931.39/27,505.35 = 10,978.92/x
3. Step 3: Cross multiply
   19,931.39x = 27,505.35 × 10,978.92
4. Step 4: Simplify right side
   19,931.39x = 301,979,037.22
5. Step 5: Solve for x
   x = 301,979,037.22/19,931.39
6. Step 6: Final answer
   x = 15,150.93