Finding the Fourth Proportional to 9,387.90, 12,954.87 and 5,196.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,387.90 : 12,954.87 = 5,196.42 : x
2. Step 2: Convert to fraction form
   9,387.90/12,954.87 = 5,196.42/x
3. Step 3: Cross multiply
   9,387.90x = 12,954.87 × 5,196.42
4. Step 4: Simplify right side
   9,387.90x = 67,318,945.57
5. Step 5: Solve for x
   x = 67,318,945.57/9,387.90
6. Step 6: Final answer
   x = 7,170.82