Finding the Fourth Proportional to 12,887.16, 17,784.28 and 7,851.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,887.16 : 17,784.28 = 7,851.38 : x
2. Step 2: Convert to fraction form
   12,887.16/17,784.28 = 7,851.38/x
3. Step 3: Cross multiply
   12,887.16x = 17,784.28 × 7,851.38
4. Step 4: Simplify right side
   12,887.16x = 139,631,140.31
5. Step 5: Solve for x
   x = 139,631,140.31/12,887.16
6. Step 6: Final answer
   x = 10,834.90