Finding the Fourth Proportional to 7,402.77, 10,215.42 and 4,215.55

Step by Step Solution

1. Step 1: Write the proportion equation
   7,402.77 : 10,215.42 = 4,215.55 : x
2. Step 2: Convert to fraction form
   7,402.77/10,215.42 = 4,215.55/x
3. Step 3: Cross multiply
   7,402.77x = 10,215.42 × 4,215.55
4. Step 4: Simplify right side
   7,402.77x = 43,063,613.78
5. Step 5: Solve for x
   x = 43,063,613.78/7,402.77
6. Step 6: Final answer
   x = 5,817.23