Finding the Fourth Proportional to 1,501.21, 2,071.39 and 871.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.21 : 2,071.39 = 871.81 : x
2. Step 2: Convert to fraction form
   1,501.21/2,071.39 = 871.81/x
3. Step 3: Cross multiply
   1,501.21x = 2,071.39 × 871.81
4. Step 4: Simplify right side
   1,501.21x = 1,805,858.52
5. Step 5: Solve for x
   x = 1,805,858.52/1,501.21
6. Step 6: Final answer
   x = 1,202.94