Finding the Fourth Proportional to 11,902.61, 16,406.55 and 9,380.54

Step by Step Solution

1. Step 1: Write the proportion equation
   11,902.61 : 16,406.55 = 9,380.54 : x
2. Step 2: Convert to fraction form
   11,902.61/16,406.55 = 9,380.54/x
3. Step 3: Cross multiply
   11,902.61x = 16,406.55 × 9,380.54
4. Step 4: Simplify right side
   11,902.61x = 153,902,339.55
5. Step 5: Solve for x
   x = 153,902,339.55/11,902.61
6. Step 6: Final answer
   x = 12,930.13