Finding the Fourth Proportional to 22,316.31, 30,796.34 and 12,890.07

Step by Step Solution

1. Step 1: Write the proportion equation
   22,316.31 : 30,796.34 = 12,890.07 : x
2. Step 2: Convert to fraction form
   22,316.31/30,796.34 = 12,890.07/x
3. Step 3: Cross multiply
   22,316.31x = 30,796.34 × 12,890.07
4. Step 4: Simplify right side
   22,316.31x = 396,966,913.89
5. Step 5: Solve for x
   x = 396,966,913.89/22,316.31
6. Step 6: Final answer
   x = 17,788.20