Finding the Fourth Proportional to 13,976.78, 19,290.71 and 8,012.45

Step by Step Solution

1. Step 1: Write the proportion equation
   13,976.78 : 19,290.71 = 8,012.45 : x
2. Step 2: Convert to fraction form
   13,976.78/19,290.71 = 8,012.45/x
3. Step 3: Cross multiply
   13,976.78x = 19,290.71 × 8,012.45
4. Step 4: Simplify right side
   13,976.78x = 154,565,849.34
5. Step 5: Solve for x
   x = 154,565,849.34/13,976.78
6. Step 6: Final answer
   x = 11,058.76