Finding the Fourth Proportional to 2,384.16, 3,290.34 and 1,389.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.16 : 3,290.34 = 1,389.53 : x
2. Step 2: Convert to fraction form
   2,384.16/3,290.34 = 1,389.53/x
3. Step 3: Cross multiply
   2,384.16x = 3,290.34 × 1,389.53
4. Step 4: Simplify right side
   2,384.16x = 4,572,026.14
5. Step 5: Solve for x
   x = 4,572,026.14/2,384.16
6. Step 6: Final answer
   x = 1,917.67