Finding the Fourth Proportional to 12,653.82, 18,978.84 and 5,156.06

Step by Step Solution

1. Step 1: Write the proportion equation
   12,653.82 : 18,978.84 = 5,156.06 : x
2. Step 2: Convert to fraction form
   12,653.82/18,978.84 = 5,156.06/x
3. Step 3: Cross multiply
   12,653.82x = 18,978.84 × 5,156.06
4. Step 4: Simplify right side
   12,653.82x = 97,855,942.88
5. Step 5: Solve for x
   x = 97,855,942.88/12,653.82
6. Step 6: Final answer
   x = 7,733.31