Finding the Fourth Proportional to 22,457.30, 30,991.30 and 12,386.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,457.30 : 30,991.30 = 12,386.15 : x
2. Step 2: Convert to fraction form
   22,457.30/30,991.30 = 12,386.15/x
3. Step 3: Cross multiply
   22,457.30x = 30,991.30 × 12,386.15
4. Step 4: Simplify right side
   22,457.30x = 383,862,890.50
5. Step 5: Solve for x
   x = 383,862,890.50/22,457.30
6. Step 6: Final answer
   x = 17,093.01