Finding the Fourth Proportional to 22,407.04, 30,923.04 and 12,978.88

Step by Step Solution

1. Step 1: Write the proportion equation
   22,407.04 : 30,923.04 = 12,978.88 : x
2. Step 2: Convert to fraction form
   22,407.04/30,923.04 = 12,978.88/x
3. Step 3: Cross multiply
   22,407.04x = 30,923.04 × 12,978.88
4. Step 4: Simplify right side
   22,407.04x = 401,346,425.40
5. Step 5: Solve for x
   x = 401,346,425.40/22,407.04
6. Step 6: Final answer
   x = 17,911.62