Finding the Fourth Proportional to 4,212.81, 5,814.72 and 2,870.64

Step by Step Solution

1. Step 1: Write the proportion equation
   4,212.81 : 5,814.72 = 2,870.64 : x
2. Step 2: Convert to fraction form
   4,212.81/5,814.72 = 2,870.64/x
3. Step 3: Cross multiply
   4,212.81x = 5,814.72 × 2,870.64
4. Step 4: Simplify right side
   4,212.81x = 16,691,967.82
5. Step 5: Solve for x
   x = 16,691,967.82/4,212.81
6. Step 6: Final answer
   x = 3,962.19