Finding the Fourth Proportional to 1,435.61, 1,981.65 and 838.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.61 : 1,981.65 = 838.31 : x
2. Step 2: Convert to fraction form
   1,435.61/1,981.65 = 838.31/x
3. Step 3: Cross multiply
   1,435.61x = 1,981.65 × 838.31
4. Step 4: Simplify right side
   1,435.61x = 1,661,227.10
5. Step 5: Solve for x
   x = 1,661,227.10/1,435.61
6. Step 6: Final answer
   x = 1,157.16