Finding the Third Proportional to 1,388.81 and 2,879.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.81 : 2,879.72 = 2,879.72 : x
2. Step 2: Convert to fraction form
   1,388.81/2,879.72 = 2,879.72/x
3. Step 3: Cross multiply
   1,388.81x = 2,879.72 × 2,879.72
4. Step 4: Simplify right side
   1,388.81x = 8,292,780.08
5. Step 5: Solve for x
   x = 8,292,780.08/1,388.81
6. Step 6: Final answer
   x = 5,971.13