Finding the Fourth Proportional to 1,429.30, 1,972.46 and 869.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.30 : 1,972.46 = 869.79 : x
2. Step 2: Convert to fraction form
   1,429.30/1,972.46 = 869.79/x
3. Step 3: Cross multiply
   1,429.30x = 1,972.46 × 869.79
4. Step 4: Simplify right side
   1,429.30x = 1,715,625.98
5. Step 5: Solve for x
   x = 1,715,625.98/1,429.30
6. Step 6: Final answer
   x = 1,200.33