Finding the Fourth Proportional to 13,071.76, 19,490.42 and 12,838.48

Step by Step Solution

1. Step 1: Write the proportion equation
   13,071.76 : 19,490.42 = 12,838.48 : x
2. Step 2: Convert to fraction form
   13,071.76/19,490.42 = 12,838.48/x
3. Step 3: Cross multiply
   13,071.76x = 19,490.42 × 12,838.48
4. Step 4: Simplify right side
   13,071.76x = 250,227,367.36
5. Step 5: Solve for x
   x = 250,227,367.36/13,071.76
6. Step 6: Final answer
   x = 19,142.59