Finding the Fourth Proportional to 5,410.80, 8,120.32 and 2,124.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,410.80 : 8,120.32 = 2,124.72 : x
2. Step 2: Convert to fraction form
   5,410.80/8,120.32 = 2,124.72/x
3. Step 3: Cross multiply
   5,410.80x = 8,120.32 × 2,124.72
4. Step 4: Simplify right side
   5,410.80x = 17,253,406.31
5. Step 5: Solve for x
   x = 17,253,406.31/5,410.80
6. Step 6: Final answer
   x = 3,188.70