Finding the Fourth Proportional to 11,388.90, 17,085.69 and 4,815.12

Step by Step Solution

1. Step 1: Write the proportion equation
   11,388.90 : 17,085.69 = 4,815.12 : x
2. Step 2: Convert to fraction form
   11,388.90/17,085.69 = 4,815.12/x
3. Step 3: Cross multiply
   11,388.90x = 17,085.69 × 4,815.12
4. Step 4: Simplify right side
   11,388.90x = 82,269,647.63
5. Step 5: Solve for x
   x = 82,269,647.63/11,388.90
6. Step 6: Final answer
   x = 7,223.67