Finding the Fourth Proportional to 22,399.30, 30,905.31 and 12,962.26

Step by Step Solution

1. Step 1: Write the proportion equation
   22,399.30 : 30,905.31 = 12,962.26 : x
2. Step 2: Convert to fraction form
   22,399.30/30,905.31 = 12,962.26/x
3. Step 3: Cross multiply
   22,399.30x = 30,905.31 × 12,962.26
4. Step 4: Simplify right side
   22,399.30x = 400,602,663.60
5. Step 5: Solve for x
   x = 400,602,663.60/22,399.30
6. Step 6: Final answer
   x = 17,884.61