Finding the Fourth Proportional to 10,936.69, 16,403.28 and 3,915.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,936.69 : 16,403.28 = 3,915.40 : x
2. Step 2: Convert to fraction form
   10,936.69/16,403.28 = 3,915.40/x
3. Step 3: Cross multiply
   10,936.69x = 16,403.28 × 3,915.40
4. Step 4: Simplify right side
   10,936.69x = 64,225,402.51
5. Step 5: Solve for x
   x = 64,225,402.51/10,936.69
6. Step 6: Final answer
   x = 5,872.47