Finding the Fourth Proportional to 2,890.59, 3,989.00 and 1,564.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.59 : 3,989.00 = 1,564.31 : x
2. Step 2: Convert to fraction form
   2,890.59/3,989.00 = 1,564.31/x
3. Step 3: Cross multiply
   2,890.59x = 3,989.00 × 1,564.31
4. Step 4: Simplify right side
   2,890.59x = 6,240,037.67
5. Step 5: Solve for x
   x = 6,240,037.67/2,890.59
6. Step 6: Final answer
   x = 2,158.74