Finding the Fourth Proportional to 1,435.91, 1,981.61 and 838.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.91 : 1,981.61 = 838.79 : x
2. Step 2: Convert to fraction form
   1,435.91/1,981.61 = 838.79/x
3. Step 3: Cross multiply
   1,435.91x = 1,981.61 × 838.79
4. Step 4: Simplify right side
   1,435.91x = 1,662,154.65
5. Step 5: Solve for x
   x = 1,662,154.65/1,435.91
6. Step 6: Final answer
   x = 1,157.56