Finding the Fourth Proportional to 1,435.75, 1,980.86 and 838.11

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.75 : 1,980.86 = 838.11 : x
2. Step 2: Convert to fraction form
   1,435.75/1,980.86 = 838.11/x
3. Step 3: Cross multiply
   1,435.75x = 1,980.86 × 838.11
4. Step 4: Simplify right side
   1,435.75x = 1,660,168.67
5. Step 5: Solve for x
   x = 1,660,168.67/1,435.75
6. Step 6: Final answer
   x = 1,156.31