Finding the Third Proportional to 1,899 and 5,131.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899 : 5,131.50 = 5,131.50 : x
2. Step 2: Convert to fraction form
   1,899/5,131.50 = 5,131.50/x
3. Step 3: Cross multiply
   1,899x = 5,131.50 × 5,131.50
4. Step 4: Simplify right side
   1,899x = 26,332,292.25
5. Step 5: Solve for x
   x = 26,332,292.25/1,899
6. Step 6: Final answer
   x = 13,866.40