Finding the Fourth Proportional to 22,978.84, 31,711.36 and 12,907.30

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.84 : 31,711.36 = 12,907.30 : x
2. Step 2: Convert to fraction form
   22,978.84/31,711.36 = 12,907.30/x
3. Step 3: Cross multiply
   22,978.84x = 31,711.36 × 12,907.30
4. Step 4: Simplify right side
   22,978.84x = 409,308,036.93
5. Step 5: Solve for x
   x = 409,308,036.93/22,978.84
6. Step 6: Final answer
   x = 17,812.39