Finding the Fourth Proportional to 2,807.65, 4,212.12 and 1,420.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,807.65 : 4,212.12 = 1,420.45 : x
2. Step 2: Convert to fraction form
   2,807.65/4,212.12 = 1,420.45/x
3. Step 3: Cross multiply
   2,807.65x = 4,212.12 × 1,420.45
4. Step 4: Simplify right side
   2,807.65x = 5,983,105.85
5. Step 5: Solve for x
   x = 5,983,105.85/2,807.65
6. Step 6: Final answer
   x = 2,131.00