Finding the Fourth Proportional to 5,300.76, 7,951.12 and 1,405.20

Step by Step Solution

1. Step 1: Write the proportion equation
   5,300.76 : 7,951.12 = 1,405.20 : x
2. Step 2: Convert to fraction form
   5,300.76/7,951.12 = 1,405.20/x
3. Step 3: Cross multiply
   5,300.76x = 7,951.12 × 1,405.20
4. Step 4: Simplify right side
   5,300.76x = 11,172,913.82
5. Step 5: Solve for x
   x = 11,172,913.82/5,300.76
6. Step 6: Final answer
   x = 2,107.79