Finding the Fourth Proportional to 12,128.23, 18,194.55 and 5,012.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,128.23 : 18,194.55 = 5,012.49 : x
2. Step 2: Convert to fraction form
   12,128.23/18,194.55 = 5,012.49/x
3. Step 3: Cross multiply
   12,128.23x = 18,194.55 × 5,012.49
4. Step 4: Simplify right side
   12,128.23x = 91,199,999.93
5. Step 5: Solve for x
   x = 91,199,999.93/12,128.23
6. Step 6: Final answer
   x = 7,519.65