Finding the Fourth Proportional to 2,173.86, 3,000.24 and 1,289.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.86 : 3,000.24 = 1,289.61 : x
2. Step 2: Convert to fraction form
   2,173.86/3,000.24 = 1,289.61/x
3. Step 3: Cross multiply
   2,173.86x = 3,000.24 × 1,289.61
4. Step 4: Simplify right side
   2,173.86x = 3,869,139.51
5. Step 5: Solve for x
   x = 3,869,139.51/2,173.86
6. Step 6: Final answer
   x = 1,779.85