Finding the Fourth Proportional to 12,150.29, 18,221.95 and 5,131.90

Step by Step Solution

1. Step 1: Write the proportion equation
   12,150.29 : 18,221.95 = 5,131.90 : x
2. Step 2: Convert to fraction form
   12,150.29/18,221.95 = 5,131.90/x
3. Step 3: Cross multiply
   12,150.29x = 18,221.95 × 5,131.90
4. Step 4: Simplify right side
   12,150.29x = 93,513,166.82
5. Step 5: Solve for x
   x = 93,513,166.82/12,150.29
6. Step 6: Final answer
   x = 7,696.37