Finding the Fourth Proportional to 1,668.32, 2,302.89 and 1,005.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,668.32 : 2,302.89 = 1,005.20 : x
2. Step 2: Convert to fraction form
   1,668.32/2,302.89 = 1,005.20/x
3. Step 3: Cross multiply
   1,668.32x = 2,302.89 × 1,005.20
4. Step 4: Simplify right side
   1,668.32x = 2,314,865.03
5. Step 5: Solve for x
   x = 2,314,865.03/1,668.32
6. Step 6: Final answer
   x = 1,387.54