Finding the Fourth Proportional to 1,429.05, 1,972.11 and 869.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.05 : 1,972.11 = 869.54 : x
2. Step 2: Convert to fraction form
   1,429.05/1,972.11 = 869.54/x
3. Step 3: Cross multiply
   1,429.05x = 1,972.11 × 869.54
4. Step 4: Simplify right side
   1,429.05x = 1,714,833.46
5. Step 5: Solve for x
   x = 1,714,833.46/1,429.05
6. Step 6: Final answer
   x = 1,199.98