Finding the Fourth Proportional to 10,156.21, 15,230.28 and 3,912.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,156.21 : 15,230.28 = 3,912.78 : x
2. Step 2: Convert to fraction form
   10,156.21/15,230.28 = 3,912.78/x
3. Step 3: Cross multiply
   10,156.21x = 15,230.28 × 3,912.78
4. Step 4: Simplify right side
   10,156.21x = 59,592,734.98
5. Step 5: Solve for x
   x = 59,592,734.98/10,156.21
6. Step 6: Final answer
   x = 5,867.62