Finding the Third Proportional to 1,890.42 and 4,128.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,890.42 : 4,128.89 = 4,128.89 : x
2. Step 2: Convert to fraction form
   1,890.42/4,128.89 = 4,128.89/x
3. Step 3: Cross multiply
   1,890.42x = 4,128.89 × 4,128.89
4. Step 4: Simplify right side
   1,890.42x = 17,047,737.79
5. Step 5: Solve for x
   x = 17,047,737.79/1,890.42
6. Step 6: Final answer
   x = 9,017.95