Finding the Fourth Proportional to 2,173.51, 2,998.09 and 1,288.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.51 : 2,998.09 = 1,288.69 : x
2. Step 2: Convert to fraction form
   2,173.51/2,998.09 = 1,288.69/x
3. Step 3: Cross multiply
   2,173.51x = 2,998.09 × 1,288.69
4. Step 4: Simplify right side
   2,173.51x = 3,863,602.72
5. Step 5: Solve for x
   x = 3,863,602.72/2,173.51
6. Step 6: Final answer
   x = 1,777.59