Finding the Fourth Proportional to 1,429.10, 1,972.29 and 839.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.10 : 1,972.29 = 839.61 : x
2. Step 2: Convert to fraction form
   1,429.10/1,972.29 = 839.61/x
3. Step 3: Cross multiply
   1,429.10x = 1,972.29 × 839.61
4. Step 4: Simplify right side
   1,429.10x = 1,655,954.41
5. Step 5: Solve for x
   x = 1,655,954.41/1,429.10
6. Step 6: Final answer
   x = 1,158.74