Finding the Fourth Proportional to 1,435.90, 2,145.11 and 911.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.90 : 2,145.11 = 911.69 : x
2. Step 2: Convert to fraction form
   1,435.90/2,145.11 = 911.69/x
3. Step 3: Cross multiply
   1,435.90x = 2,145.11 × 911.69
4. Step 4: Simplify right side
   1,435.90x = 1,955,675.34
5. Step 5: Solve for x
   x = 1,955,675.34/1,435.90
6. Step 6: Final answer
   x = 1,361.99