Finding the Fourth Proportional to 9,415.34, 12,993.16 and 5,223.58

Step by Step Solution

1. Step 1: Write the proportion equation
   9,415.34 : 12,993.16 = 5,223.58 : x
2. Step 2: Convert to fraction form
   9,415.34/12,993.16 = 5,223.58/x
3. Step 3: Cross multiply
   9,415.34x = 12,993.16 × 5,223.58
4. Step 4: Simplify right side
   9,415.34x = 67,870,810.71
5. Step 5: Solve for x
   x = 67,870,810.71/9,415.34
6. Step 6: Final answer
   x = 7,208.54