Finding the Fourth Proportional to 12,151.17, 18,241.81 and 7,978.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,151.17 : 18,241.81 = 7,978.12 : x
2. Step 2: Convert to fraction form
   12,151.17/18,241.81 = 7,978.12/x
3. Step 3: Cross multiply
   12,151.17x = 18,241.81 × 7,978.12
4. Step 4: Simplify right side
   12,151.17x = 145,535,283.65
5. Step 5: Solve for x
   x = 145,535,283.65/12,151.17
6. Step 6: Final answer
   x = 11,977.06