Finding the Third Proportional to 1,385.16 and 2,987.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,385.16 : 2,987.72 = 2,987.72 : x
2. Step 2: Convert to fraction form
   1,385.16/2,987.72 = 2,987.72/x
3. Step 3: Cross multiply
   1,385.16x = 2,987.72 × 2,987.72
4. Step 4: Simplify right side
   1,385.16x = 8,926,463.33
5. Step 5: Solve for x
   x = 8,926,463.33/1,385.16
6. Step 6: Final answer
   x = 6,444.37