Finding the Fourth Proportional to 1,931.42, 2,661.79 and 1,371.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.42 : 2,661.79 = 1,371.91 : x
2. Step 2: Convert to fraction form
   1,931.42/2,661.79 = 1,371.91/x
3. Step 3: Cross multiply
   1,931.42x = 2,661.79 × 1,371.91
4. Step 4: Simplify right side
   1,931.42x = 3,651,736.32
5. Step 5: Solve for x
   x = 3,651,736.32/1,931.42
6. Step 6: Final answer
   x = 1,890.70