Finding the Fourth Proportional to 2,070.16, 3,105.30 and 609.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,070.16 : 3,105.30 = 609.40 : x
2. Step 2: Convert to fraction form
   2,070.16/3,105.30 = 609.40/x
3. Step 3: Cross multiply
   2,070.16x = 3,105.30 × 609.40
4. Step 4: Simplify right side
   2,070.16x = 1,892,369.82
5. Step 5: Solve for x
   x = 1,892,369.82/2,070.16
6. Step 6: Final answer
   x = 914.12