Finding the Fourth Proportional to 1,501.07, 2,071.31 and 871.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,501.07 : 2,071.31 = 871.61 : x
2. Step 2: Convert to fraction form
   1,501.07/2,071.31 = 871.61/x
3. Step 3: Cross multiply
   1,501.07x = 2,071.31 × 871.61
4. Step 4: Simplify right side
   1,501.07x = 1,805,359.79
5. Step 5: Solve for x
   x = 1,805,359.79/1,501.07
6. Step 6: Final answer
   x = 1,202.72