Finding the Fourth Proportional to 5,405.91, 8,084.16 and 3,930.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,405.91 : 8,084.16 = 3,930.09 : x
2. Step 2: Convert to fraction form
   5,405.91/8,084.16 = 3,930.09/x
3. Step 3: Cross multiply
   5,405.91x = 8,084.16 × 3,930.09
4. Step 4: Simplify right side
   5,405.91x = 31,771,476.37
5. Step 5: Solve for x
   x = 31,771,476.37/5,405.91
6. Step 6: Final answer
   x = 5,877.17