Finding the Fourth Proportional to 1,971.01, 2,720.10 and 1,131.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,971.01 : 2,720.10 = 1,131.71 : x
2. Step 2: Convert to fraction form
   1,971.01/2,720.10 = 1,131.71/x
3. Step 3: Cross multiply
   1,971.01x = 2,720.10 × 1,131.71
4. Step 4: Simplify right side
   1,971.01x = 3,078,364.37
5. Step 5: Solve for x
   x = 3,078,364.37/1,971.01
6. Step 6: Final answer
   x = 1,561.82