Finding the Fourth Proportional to 13,978.85, 19,294.61 and 8,315.73

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.85 : 19,294.61 = 8,315.73 : x
2. Step 2: Convert to fraction form
   13,978.85/19,294.61 = 8,315.73/x
3. Step 3: Cross multiply
   13,978.85x = 19,294.61 × 8,315.73
4. Step 4: Simplify right side
   13,978.85x = 160,448,725.64
5. Step 5: Solve for x
   x = 160,448,725.64/13,978.85
6. Step 6: Final answer
   x = 11,477.97