Finding the Fourth Proportional to 1,662.08, 2,486.40 and 1,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,662.08 : 2,486.40 = 1,388.72 : x
2. Step 2: Convert to fraction form
   1,662.08/2,486.40 = 1,388.72/x
3. Step 3: Cross multiply
   1,662.08x = 2,486.40 × 1,388.72
4. Step 4: Simplify right side
   1,662.08x = 3,452,913.41
5. Step 5: Solve for x
   x = 3,452,913.41/1,662.08
6. Step 6: Final answer
   x = 2,077.47