Finding the Fourth Proportional to 22,420.52, 30,939.68 and 12,862.00

Step by Step Solution

1. Step 1: Write the proportion equation
   22,420.52 : 30,939.68 = 12,862.00 : x
2. Step 2: Convert to fraction form
   22,420.52/30,939.68 = 12,862.00/x
3. Step 3: Cross multiply
   22,420.52x = 30,939.68 × 12,862.00
4. Step 4: Simplify right side
   22,420.52x = 397,945,945.15
5. Step 5: Solve for x
   x = 397,945,945.15/22,420.52
6. Step 6: Final answer
   x = 17,749.19