Finding the Fourth Proportional to 1,500.78, 2,071.33 and 871.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,500.78 : 2,071.33 = 871.72 : x
2. Step 2: Convert to fraction form
   1,500.78/2,071.33 = 871.72/x
3. Step 3: Cross multiply
   1,500.78x = 2,071.33 × 871.72
4. Step 4: Simplify right side
   1,500.78x = 1,805,612.43
5. Step 5: Solve for x
   x = 1,805,612.43/1,500.78
6. Step 6: Final answer
   x = 1,203.11