Finding the Fourth Proportional to 10,469.61, 15,704.38 and 2,678.40

Step by Step Solution

1. Step 1: Write the proportion equation
   10,469.61 : 15,704.38 = 2,678.40 : x
2. Step 2: Convert to fraction form
   10,469.61/15,704.38 = 2,678.40/x
3. Step 3: Cross multiply
   10,469.61x = 15,704.38 × 2,678.40
4. Step 4: Simplify right side
   10,469.61x = 42,062,611.39
5. Step 5: Solve for x
   x = 42,062,611.39/10,469.61
6. Step 6: Final answer
   x = 4,017.59