Finding the Fourth Proportional to 2,397.82, 3,309.00 and 1,389.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,397.82 : 3,309.00 = 1,389.72 : x
2. Step 2: Convert to fraction form
   2,397.82/3,309.00 = 1,389.72/x
3. Step 3: Cross multiply
   2,397.82x = 3,309.00 × 1,389.72
4. Step 4: Simplify right side
   2,397.82x = 4,598,601.25
5. Step 5: Solve for x
   x = 4,598,601.25/2,397.82
6. Step 6: Final answer
   x = 1,917.82