Finding the Fourth Proportional to 1,573.40, 2,171.29 and 865.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,573.40 : 2,171.29 = 865.30 : x
2. Step 2: Convert to fraction form
   1,573.40/2,171.29 = 865.30/x
3. Step 3: Cross multiply
   1,573.40x = 2,171.29 × 865.30
4. Step 4: Simplify right side
   1,573.40x = 1,878,812.89
5. Step 5: Solve for x
   x = 1,878,812.89/1,573.40
6. Step 6: Final answer
   x = 1,194.11