Finding the Fourth Proportional to 13,978.22, 19,289.83 and 7,929.61

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.22 : 19,289.83 = 7,929.61 : x
2. Step 2: Convert to fraction form
   13,978.22/19,289.83 = 7,929.61/x
3. Step 3: Cross multiply
   13,978.22x = 19,289.83 × 7,929.61
4. Step 4: Simplify right side
   13,978.22x = 152,960,828.87
5. Step 5: Solve for x
   x = 152,960,828.87/13,978.22
6. Step 6: Final answer
   x = 10,942.80