Finding the Fourth Proportional to 10,142.73, 15,209.94 and 4,215.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.73 : 15,209.94 = 4,215.56 : x
2. Step 2: Convert to fraction form
   10,142.73/15,209.94 = 4,215.56/x
3. Step 3: Cross multiply
   10,142.73x = 15,209.94 × 4,215.56
4. Step 4: Simplify right side
   10,142.73x = 64,118,338.62
5. Step 5: Solve for x
   x = 64,118,338.62/10,142.73
6. Step 6: Final answer
   x = 6,321.61