Finding the Fourth Proportional to 20,513.67, 30,774.15 and 7,187.55

Step by Step Solution

1. Step 1: Write the proportion equation
   20,513.67 : 30,774.15 = 7,187.55 : x
2. Step 2: Convert to fraction form
   20,513.67/30,774.15 = 7,187.55/x
3. Step 3: Cross multiply
   20,513.67x = 30,774.15 × 7,187.55
4. Step 4: Simplify right side
   20,513.67x = 221,190,741.83
5. Step 5: Solve for x
   x = 221,190,741.83/20,513.67
6. Step 6: Final answer
   x = 10,782.60