Finding the Fourth Proportional to 9,380.63, 12,945.26 and 5,131.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,380.63 : 12,945.26 = 5,131.61 : x
2. Step 2: Convert to fraction form
   9,380.63/12,945.26 = 5,131.61/x
3. Step 3: Cross multiply
   9,380.63x = 12,945.26 × 5,131.61
4. Step 4: Simplify right side
   9,380.63x = 66,429,935.28
5. Step 5: Solve for x
   x = 66,429,935.28/9,380.63
6. Step 6: Final answer
   x = 7,081.61