Finding the Fourth Proportional to 1,429.02, 1,971.90 and 839.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.02 : 1,971.90 = 839.43 : x
2. Step 2: Convert to fraction form
   1,429.02/1,971.90 = 839.43/x
3. Step 3: Cross multiply
   1,429.02x = 1,971.90 × 839.43
4. Step 4: Simplify right side
   1,429.02x = 1,655,272.02
5. Step 5: Solve for x
   x = 1,655,272.02/1,429.02
6. Step 6: Final answer
   x = 1,158.33