Finding the Fourth Proportional to 18,890.67, 28,300.77 and 12,632.25

Step by Step Solution

1. Step 1: Write the proportion equation
   18,890.67 : 28,300.77 = 12,632.25 : x
2. Step 2: Convert to fraction form
   18,890.67/28,300.77 = 12,632.25/x
3. Step 3: Cross multiply
   18,890.67x = 28,300.77 × 12,632.25
4. Step 4: Simplify right side
   18,890.67x = 357,502,401.83
5. Step 5: Solve for x
   x = 357,502,401.83/18,890.67
6. Step 6: Final answer
   x = 18,924.81