Finding the Fourth Proportional to 12,156.84, 16,778.52 and 7,679.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,156.84 : 16,778.52 = 7,679.16 : x
2. Step 2: Convert to fraction form
   12,156.84/16,778.52 = 7,679.16/x
3. Step 3: Cross multiply
   12,156.84x = 16,778.52 × 7,679.16
4. Step 4: Simplify right side
   12,156.84x = 128,844,939.64
5. Step 5: Solve for x
   x = 128,844,939.64/12,156.84
6. Step 6: Final answer
   x = 10,598.56