Finding the Fourth Proportional to 12,180.51, 18,256.94 and 5,156.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,180.51 : 18,256.94 = 5,156.15 : x
2. Step 2: Convert to fraction form
   12,180.51/18,256.94 = 5,156.15/x
3. Step 3: Cross multiply
   12,180.51x = 18,256.94 × 5,156.15
4. Step 4: Simplify right side
   12,180.51x = 94,135,404.12
5. Step 5: Solve for x
   x = 94,135,404.12/12,180.51
6. Step 6: Final answer
   x = 7,728.36