Finding the Fourth Proportional to 12,117.70, 16,730.71 and 9,280.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,117.70 : 16,730.71 = 9,280.07 : x
2. Step 2: Convert to fraction form
   12,117.70/16,730.71 = 9,280.07/x
3. Step 3: Cross multiply
   12,117.70x = 16,730.71 × 9,280.07
4. Step 4: Simplify right side
   12,117.70x = 155,262,076.30
5. Step 5: Solve for x
   x = 155,262,076.30/12,117.70
6. Step 6: Final answer
   x = 12,812.84