Finding the Fourth Proportional to 12,621.78, 17,417.79 and 7,317.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,621.78 : 17,417.79 = 7,317.54 : x
2. Step 2: Convert to fraction form
   12,621.78/17,417.79 = 7,317.54/x
3. Step 3: Cross multiply
   12,621.78x = 17,417.79 × 7,317.54
4. Step 4: Simplify right side
   12,621.78x = 127,455,375.04
5. Step 5: Solve for x
   x = 127,455,375.04/12,621.78
6. Step 6: Final answer
   x = 10,098.05