Finding the Fourth Proportional to 2,384.55, 3,290.28 and 1,389.87

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.55 : 3,290.28 = 1,389.87 : x
2. Step 2: Convert to fraction form
   2,384.55/3,290.28 = 1,389.87/x
3. Step 3: Cross multiply
   2,384.55x = 3,290.28 × 1,389.87
4. Step 4: Simplify right side
   2,384.55x = 4,573,061.46
5. Step 5: Solve for x
   x = 4,573,061.46/2,384.55
6. Step 6: Final answer
   x = 1,917.79