Finding the Fourth Proportional to 13,863.45, 20,770.43 and 7,191.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,863.45 : 20,770.43 = 7,191.89 : x
2. Step 2: Convert to fraction form
   13,863.45/20,770.43 = 7,191.89/x
3. Step 3: Cross multiply
   13,863.45x = 20,770.43 × 7,191.89
4. Step 4: Simplify right side
   13,863.45x = 149,378,585.89
5. Step 5: Solve for x
   x = 149,378,585.89/13,863.45
6. Step 6: Final answer
   x = 10,774.99