Finding the Fourth Proportional to 9,405.74, 12,980.83 and 5,215.02

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.74 : 12,980.83 = 5,215.02 : x
2. Step 2: Convert to fraction form
   9,405.74/12,980.83 = 5,215.02/x
3. Step 3: Cross multiply
   9,405.74x = 12,980.83 × 5,215.02
4. Step 4: Simplify right side
   9,405.74x = 67,695,288.07
5. Step 5: Solve for x
   x = 67,695,288.07/9,405.74
6. Step 6: Final answer
   x = 7,197.23