Finding the Fourth Proportional to 2,025.21, 2,776.56 and 1,988.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,025.21 : 2,776.56 = 1,988.30 : x
2. Step 2: Convert to fraction form
   2,025.21/2,776.56 = 1,988.30/x
3. Step 3: Cross multiply
   2,025.21x = 2,776.56 × 1,988.30
4. Step 4: Simplify right side
   2,025.21x = 5,520,624.31
5. Step 5: Solve for x
   x = 5,520,624.31/2,025.21
6. Step 6: Final answer
   x = 2,725.96