Finding the Fourth Proportional to 10,674.78, 15,990.71 and 5,321.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,674.78 : 15,990.71 = 5,321.81 : x
2. Step 2: Convert to fraction form
   10,674.78/15,990.71 = 5,321.81/x
3. Step 3: Cross multiply
   10,674.78x = 15,990.71 × 5,321.81
4. Step 4: Simplify right side
   10,674.78x = 85,099,440.43
5. Step 5: Solve for x
   x = 85,099,440.43/10,674.78
6. Step 6: Final answer
   x = 7,972.01