Finding the Fourth Proportional to 2,543.58, 3,816.58 and 1,389.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,543.58 : 3,816.58 = 1,389.30 : x
2. Step 2: Convert to fraction form
   2,543.58/3,816.58 = 1,389.30/x
3. Step 3: Cross multiply
   2,543.58x = 3,816.58 × 1,389.30
4. Step 4: Simplify right side
   2,543.58x = 5,302,374.59
5. Step 5: Solve for x
   x = 5,302,374.59/2,543.58
6. Step 6: Final answer
   x = 2,084.61