Finding the Fourth Proportional to 9,410.06, 12,985.90 and 5,218.30

Step by Step Solution

1. Step 1: Write the proportion equation
   9,410.06 : 12,985.90 = 5,218.30 : x
2. Step 2: Convert to fraction form
   9,410.06/12,985.90 = 5,218.30/x
3. Step 3: Cross multiply
   9,410.06x = 12,985.90 × 5,218.30
4. Step 4: Simplify right side
   9,410.06x = 67,764,321.97
5. Step 5: Solve for x
   x = 67,764,321.97/9,410.06
6. Step 6: Final answer
   x = 7,201.26