Finding the Fourth Proportional to 2,138.86, 3,207.18 and 1,445.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,138.86 : 3,207.18 = 1,445.50 : x
2. Step 2: Convert to fraction form
   2,138.86/3,207.18 = 1,445.50/x
3. Step 3: Cross multiply
   2,138.86x = 3,207.18 × 1,445.50
4. Step 4: Simplify right side
   2,138.86x = 4,635,978.69
5. Step 5: Solve for x
   x = 4,635,978.69/2,138.86
6. Step 6: Final answer
   x = 2,167.50