Finding the Fourth Proportional to 2,142.04, 3,213.20 and 909.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,142.04 : 3,213.20 = 909.30 : x
2. Step 2: Convert to fraction form
   2,142.04/3,213.20 = 909.30/x
3. Step 3: Cross multiply
   2,142.04x = 3,213.20 × 909.30
4. Step 4: Simplify right side
   2,142.04x = 2,921,762.76
5. Step 5: Solve for x
   x = 2,921,762.76/2,142.04
6. Step 6: Final answer
   x = 1,364.01