Finding the Fourth Proportional to 1,429.34, 1,972.53 and 839.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.34 : 1,972.53 = 839.76 : x
2. Step 2: Convert to fraction form
   1,429.34/1,972.53 = 839.76/x
3. Step 3: Cross multiply
   1,429.34x = 1,972.53 × 839.76
4. Step 4: Simplify right side
   1,429.34x = 1,656,451.79
5. Step 5: Solve for x
   x = 1,656,451.79/1,429.34
6. Step 6: Final answer
   x = 1,158.90