Finding the Fourth Proportional to 2,214.81, 3,321.68 and 1,488.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,214.81 : 3,321.68 = 1,488.78 : x
2. Step 2: Convert to fraction form
   2,214.81/3,321.68 = 1,488.78/x
3. Step 3: Cross multiply
   2,214.81x = 3,321.68 × 1,488.78
4. Step 4: Simplify right side
   2,214.81x = 4,945,243.31
5. Step 5: Solve for x
   x = 4,945,243.31/2,214.81
6. Step 6: Final answer
   x = 2,232.81