Finding the Fourth Proportional to 1,911.23, 2,637.61 and 1,071.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,911.23 : 2,637.61 = 1,071.89 : x
2. Step 2: Convert to fraction form
   1,911.23/2,637.61 = 1,071.89/x
3. Step 3: Cross multiply
   1,911.23x = 2,637.61 × 1,071.89
4. Step 4: Simplify right side
   1,911.23x = 2,827,227.78
5. Step 5: Solve for x
   x = 2,827,227.78/1,911.23
6. Step 6: Final answer
   x = 1,479.27