Finding the Fourth Proportional to 1,435.88, 1,981.61 and 838.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.88 : 1,981.61 = 838.55 : x
2. Step 2: Convert to fraction form
   1,435.88/1,981.61 = 838.55/x
3. Step 3: Cross multiply
   1,435.88x = 1,981.61 × 838.55
4. Step 4: Simplify right side
   1,435.88x = 1,661,664.96
5. Step 5: Solve for x
   x = 1,661,664.96/1,435.88
6. Step 6: Final answer
   x = 1,157.25