Finding the Fourth Proportional to 10,300.89, 15,423.66 and 8,474.06

Step by Step Solution

1. Step 1: Write the proportion equation
   10,300.89 : 15,423.66 = 8,474.06 : x
2. Step 2: Convert to fraction form
   10,300.89/15,423.66 = 8,474.06/x
3. Step 3: Cross multiply
   10,300.89x = 15,423.66 × 8,474.06
4. Step 4: Simplify right side
   10,300.89x = 130,700,977.89
5. Step 5: Solve for x
   x = 130,700,977.89/10,300.89
6. Step 6: Final answer
   x = 12,688.32