Finding the Fourth Proportional to 3,389.88, 5,085.72 and 1,200.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,389.88 : 5,085.72 = 1,200.15 : x
2. Step 2: Convert to fraction form
   3,389.88/5,085.72 = 1,200.15/x
3. Step 3: Cross multiply
   3,389.88x = 5,085.72 × 1,200.15
4. Step 4: Simplify right side
   3,389.88x = 6,103,626.86
5. Step 5: Solve for x
   x = 6,103,626.86/3,389.88
6. Step 6: Final answer
   x = 1,800.54