Finding the Fourth Proportional to 22,978.84, 31,708.56 and 12,905

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.84 : 31,708.56 = 12,905 : x
2. Step 2: Convert to fraction form
   22,978.84/31,708.56 = 12,905/x
3. Step 3: Cross multiply
   22,978.84x = 31,708.56 × 12,905
4. Step 4: Simplify right side
   22,978.84x = 409,198,966.80
5. Step 5: Solve for x
   x = 409,198,966.80/22,978.84
6. Step 6: Final answer
   x = 17,807.64