Finding the Fourth Proportional to 1,429.45, 1,972.25 and 869.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.45 : 1,972.25 = 869.94 : x
2. Step 2: Convert to fraction form
   1,429.45/1,972.25 = 869.94/x
3. Step 3: Cross multiply
   1,429.45x = 1,972.25 × 869.94
4. Step 4: Simplify right side
   1,429.45x = 1,715,738.08
5. Step 5: Solve for x
   x = 1,715,738.08/1,429.45
6. Step 6: Final answer
   x = 1,200.28