Finding the Fourth Proportional to 1,501.31, 2,071.76 and 871.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.31 : 2,071.76 = 871.89 : x
2. Step 2: Convert to fraction form
   1,501.31/2,071.76 = 871.89/x
3. Step 3: Cross multiply
   1,501.31x = 2,071.76 × 871.89
4. Step 4: Simplify right side
   1,501.31x = 1,806,346.83
5. Step 5: Solve for x
   x = 1,806,346.83/1,501.31
6. Step 6: Final answer
   x = 1,203.18