Finding the Fourth Proportional to 1,488.63, 2,053.58 and 1,209.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.63 : 2,053.58 = 1,209.18 : x
2. Step 2: Convert to fraction form
   1,488.63/2,053.58 = 1,209.18/x
3. Step 3: Cross multiply
   1,488.63x = 2,053.58 × 1,209.18
4. Step 4: Simplify right side
   1,488.63x = 2,483,141.82
5. Step 5: Solve for x
   x = 2,483,141.82/1,488.63
6. Step 6: Final answer
   x = 1,668.07