Finding the Fourth Proportional to 27,978.42, 38,610.81 and 15,403.17

Step by Step Solution

1. Step 1: Write the proportion equation
   27,978.42 : 38,610.81 = 15,403.17 : x
2. Step 2: Convert to fraction form
   27,978.42/38,610.81 = 15,403.17/x
3. Step 3: Cross multiply
   27,978.42x = 38,610.81 × 15,403.17
4. Step 4: Simplify right side
   27,978.42x = 594,728,870.27
5. Step 5: Solve for x
   x = 594,728,870.27/27,978.42
6. Step 6: Final answer
   x = 21,256.70