Finding the Fourth Proportional to 2,173.88, 2,997.89 and 1,428.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.88 : 2,997.89 = 1,428.47 : x
2. Step 2: Convert to fraction form
   2,173.88/2,997.89 = 1,428.47/x
3. Step 3: Cross multiply
   2,173.88x = 2,997.89 × 1,428.47
4. Step 4: Simplify right side
   2,173.88x = 4,282,388.79
5. Step 5: Solve for x
   x = 4,282,388.79/2,173.88
6. Step 6: Final answer
   x = 1,969.93