Finding the Third Proportional to 2,112.75 and 4,890.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,112.75 : 4,890.90 = 4,890.90 : x
2. Step 2: Convert to fraction form
   2,112.75/4,890.90 = 4,890.90/x
3. Step 3: Cross multiply
   2,112.75x = 4,890.90 × 4,890.90
4. Step 4: Simplify right side
   2,112.75x = 23,920,925.74
5. Step 5: Solve for x
   x = 23,920,925.74/2,112.75
6. Step 6: Final answer
   x = 11,322.18