Finding the Fourth Proportional to 1,012.50, 1,395.72 and 871.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,012.50 : 1,395.72 = 871.88 : x
2. Step 2: Convert to fraction form
   1,012.50/1,395.72 = 871.88/x
3. Step 3: Cross multiply
   1,012.50x = 1,395.72 × 871.88
4. Step 4: Simplify right side
   1,012.50x = 1,216,893.38
5. Step 5: Solve for x
   x = 1,216,893.38/1,012.50
6. Step 6: Final answer
   x = 1,201.87