Finding the Fourth Proportional to 13,280.71, 18,327.18 and 7,906.90

Step by Step Solution

1. Step 1: Write the proportion equation
   13,280.71 : 18,327.18 = 7,906.90 : x
2. Step 2: Convert to fraction form
   13,280.71/18,327.18 = 7,906.90/x
3. Step 3: Cross multiply
   13,280.71x = 18,327.18 × 7,906.90
4. Step 4: Simplify right side
   13,280.71x = 144,911,179.54
5. Step 5: Solve for x
   x = 144,911,179.54/13,280.71
6. Step 6: Final answer
   x = 10,911.40