Finding the Fourth Proportional to 9,380.75, 12,945.33 and 5,131.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.75 : 12,945.33 = 5,131.76 : x
2. Step 2: Convert to fraction form
   9,380.75/12,945.33 = 5,131.76/x
3. Step 3: Cross multiply
   9,380.75x = 12,945.33 × 5,131.76
4. Step 4: Simplify right side
   9,380.75x = 66,432,359.04
5. Step 5: Solve for x
   x = 66,432,359.04/9,380.75
6. Step 6: Final answer
   x = 7,081.78