Finding the Fourth Proportional to 1,429.41, 1,972.35 and 869.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.41 : 1,972.35 = 869.58 : x
2. Step 2: Convert to fraction form
   1,429.41/1,972.35 = 869.58/x
3. Step 3: Cross multiply
   1,429.41x = 1,972.35 × 869.58
4. Step 4: Simplify right side
   1,429.41x = 1,715,116.11
5. Step 5: Solve for x
   x = 1,715,116.11/1,429.41
6. Step 6: Final answer
   x = 1,199.88