Finding the Fourth Proportional to 22,558.03, 31,131.15 and 12,999.34

Step by Step Solution

1. Step 1: Write the proportion equation
   22,558.03 : 31,131.15 = 12,999.34 : x
2. Step 2: Convert to fraction form
   22,558.03/31,131.15 = 12,999.34/x
3. Step 3: Cross multiply
   22,558.03x = 31,131.15 × 12,999.34
4. Step 4: Simplify right side
   22,558.03x = 404,684,403.44
5. Step 5: Solve for x
   x = 404,684,403.44/22,558.03
6. Step 6: Final answer
   x = 17,939.70