Finding the Fourth Proportional to 22,978.60, 31,710.47 and 12,907.06

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.60 : 31,710.47 = 12,907.06 : x
2. Step 2: Convert to fraction form
   22,978.60/31,710.47 = 12,907.06/x
3. Step 3: Cross multiply
   22,978.60x = 31,710.47 × 12,907.06
4. Step 4: Simplify right side
   22,978.60x = 409,288,938.92
5. Step 5: Solve for x
   x = 409,288,938.92/22,978.60
6. Step 6: Final answer
   x = 17,811.74