Finding the Fourth Proportional to 1,543.69, 2,130.21 and 871.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,543.69 : 2,130.21 = 871.50 : x
2. Step 2: Convert to fraction form
   1,543.69/2,130.21 = 871.50/x
3. Step 3: Cross multiply
   1,543.69x = 2,130.21 × 871.50
4. Step 4: Simplify right side
   1,543.69x = 1,856,478.02
5. Step 5: Solve for x
   x = 1,856,478.02/1,543.69
6. Step 6: Final answer
   x = 1,202.63