Finding the Fourth Proportional to 12,887.84, 17,788.61 and 7,855.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.84 : 17,788.61 = 7,855.38 : x
2. Step 2: Convert to fraction form
   12,887.84/17,788.61 = 7,855.38/x
3. Step 3: Cross multiply
   12,887.84x = 17,788.61 × 7,855.38
4. Step 4: Simplify right side
   12,887.84x = 139,736,310.86
5. Step 5: Solve for x
   x = 139,736,310.86/12,887.84
6. Step 6: Final answer
   x = 10,842.49