Finding the Fourth Proportional to 12,820.50, 19,231.47 and 3,587.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,820.50 : 19,231.47 = 3,587.22 : x
2. Step 2: Convert to fraction form
   12,820.50/19,231.47 = 3,587.22/x
3. Step 3: Cross multiply
   12,820.50x = 19,231.47 × 3,587.22
4. Step 4: Simplify right side
   12,820.50x = 68,987,513.81
5. Step 5: Solve for x
   x = 68,987,513.81/12,820.50
6. Step 6: Final answer
   x = 5,381.03