Finding the Fourth Proportional to 2,185.01, 3,017.31 and 1,388.59

Step by Step Solution

1. Step 1: Write the proportion equation
   2,185.01 : 3,017.31 = 1,388.59 : x
2. Step 2: Convert to fraction form
   2,185.01/3,017.31 = 1,388.59/x
3. Step 3: Cross multiply
   2,185.01x = 3,017.31 × 1,388.59
4. Step 4: Simplify right side
   2,185.01x = 4,189,806.49
5. Step 5: Solve for x
   x = 4,189,806.49/2,185.01
6. Step 6: Final answer
   x = 1,917.52