Finding the Fourth Proportional to 1,429.49, 1,972.11 and 869.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.49 : 1,972.11 = 869.51 : x
2. Step 2: Convert to fraction form
   1,429.49/1,972.11 = 869.51/x
3. Step 3: Cross multiply
   1,429.49x = 1,972.11 × 869.51
4. Step 4: Simplify right side
   1,429.49x = 1,714,759.51
5. Step 5: Solve for x
   x = 1,714,759.51/1,429.49
6. Step 6: Final answer
   x = 1,199.56