Finding the Fourth Proportional to 5,405.30, 8,105.52 and 2,116.70

Step by Step Solution

1. Step 1: Write the proportion equation
   5,405.30 : 8,105.52 = 2,116.70 : x
2. Step 2: Convert to fraction form
   5,405.30/8,105.52 = 2,116.70/x
3. Step 3: Cross multiply
   5,405.30x = 8,105.52 × 2,116.70
4. Step 4: Simplify right side
   5,405.30x = 17,156,954.18
5. Step 5: Solve for x
   x = 17,156,954.18/5,405.30
6. Step 6: Final answer
   x = 3,174.10