Finding the Fourth Proportional to 1,488.06, 2,221.47 and 1,389.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.06 : 2,221.47 = 1,389.24 : x
2. Step 2: Convert to fraction form
   1,488.06/2,221.47 = 1,389.24/x
3. Step 3: Cross multiply
   1,488.06x = 2,221.47 × 1,389.24
4. Step 4: Simplify right side
   1,488.06x = 3,086,154.98
5. Step 5: Solve for x
   x = 3,086,154.98/1,488.06
6. Step 6: Final answer
   x = 2,073.95