Finding the Fourth Proportional to 25,665.21, 38,510.06 and 13,978.17

Step by Step Solution

1. Step 1: Write the proportion equation
   25,665.21 : 38,510.06 = 13,978.17 : x
2. Step 2: Convert to fraction form
   25,665.21/38,510.06 = 13,978.17/x
3. Step 3: Cross multiply
   25,665.21x = 38,510.06 × 13,978.17
4. Step 4: Simplify right side
   25,665.21x = 538,300,095.50
5. Step 5: Solve for x
   x = 538,300,095.50/25,665.21
6. Step 6: Final answer
   x = 20,973.92