Finding the Third Proportional to 1,868.91 and 3,100.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,868.91 : 3,100.78 = 3,100.78 : x
2. Step 2: Convert to fraction form
   1,868.91/3,100.78 = 3,100.78/x
3. Step 3: Cross multiply
   1,868.91x = 3,100.78 × 3,100.78
4. Step 4: Simplify right side
   1,868.91x = 9,614,844.36
5. Step 5: Solve for x
   x = 9,614,844.36/1,868.91
6. Step 6: Final answer
   x = 5,144.64