Finding the Fourth Proportional to 19,931.15, 27,505.19 and 10,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   19,931.15 : 27,505.19 = 10,978.88 : x
2. Step 2: Convert to fraction form
   19,931.15/27,505.19 = 10,978.88/x
3. Step 3: Cross multiply
   19,931.15x = 27,505.19 × 10,978.88
4. Step 4: Simplify right side
   19,931.15x = 301,976,008.55
5. Step 5: Solve for x
   x = 301,976,008.55/19,931.15
6. Step 6: Final answer
   x = 15,150.96