Finding the Fourth Proportional to 8,504.25, 12,693.95 and 7,878.01

Step by Step Solution

1. Step 1: Write the proportion equation
   8,504.25 : 12,693.95 = 7,878.01 : x
2. Step 2: Convert to fraction form
   8,504.25/12,693.95 = 7,878.01/x
3. Step 3: Cross multiply
   8,504.25x = 12,693.95 × 7,878.01
4. Step 4: Simplify right side
   8,504.25x = 100,002,962.18
5. Step 5: Solve for x
   x = 100,002,962.18/8,504.25
6. Step 6: Final answer
   x = 11,759.18