Finding the Fourth Proportional to 18,667.16, 28,012.18 and 7,420.52

Step by Step Solution

1. Step 1: Write the proportion equation
   18,667.16 : 28,012.18 = 7,420.52 : x
2. Step 2: Convert to fraction form
   18,667.16/28,012.18 = 7,420.52/x
3. Step 3: Cross multiply
   18,667.16x = 28,012.18 × 7,420.52
4. Step 4: Simplify right side
   18,667.16x = 207,864,941.93
5. Step 5: Solve for x
   x = 207,864,941.93/18,667.16
6. Step 6: Final answer
   x = 11,135.33