Finding the Fourth Proportional to 13,042.72, 19,526.83 and 12,215.14

Step by Step Solution

1. Step 1: Write the proportion equation
   13,042.72 : 19,526.83 = 12,215.14 : x
2. Step 2: Convert to fraction form
   13,042.72/19,526.83 = 12,215.14/x
3. Step 3: Cross multiply
   13,042.72x = 19,526.83 × 12,215.14
4. Step 4: Simplify right side
   13,042.72x = 238,522,927.55
5. Step 5: Solve for x
   x = 238,522,927.55/13,042.72
6. Step 6: Final answer
   x = 18,287.82