Finding the Fourth Proportional to 1,661.90, 2,291.91 and 1,330.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,661.90 : 2,291.91 = 1,330.34 : x
2. Step 2: Convert to fraction form
   1,661.90/2,291.91 = 1,330.34/x
3. Step 3: Cross multiply
   1,661.90x = 2,291.91 × 1,330.34
4. Step 4: Simplify right side
   1,661.90x = 3,049,019.55
5. Step 5: Solve for x
   x = 3,049,019.55/1,661.90
6. Step 6: Final answer
   x = 1,834.66