Finding the Fourth Proportional to 19,931.23, 27,505.16 and 10,978.71

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.23 : 27,505.16 = 10,978.71 : x
2. Step 2: Convert to fraction form
   19,931.23/27,505.16 = 10,978.71/x
3. Step 3: Cross multiply
   19,931.23x = 27,505.16 × 10,978.71
4. Step 4: Simplify right side
   19,931.23x = 301,971,202.59
5. Step 5: Solve for x
   x = 301,971,202.59/19,931.23
6. Step 6: Final answer
   x = 15,150.66