Finding the Fourth Proportional to 2,115.30, 3,173.15 and 555.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,115.30 : 3,173.15 = 555.31 : x
2. Step 2: Convert to fraction form
   2,115.30/3,173.15 = 555.31/x
3. Step 3: Cross multiply
   2,115.30x = 3,173.15 × 555.31
4. Step 4: Simplify right side
   2,115.30x = 1,762,081.93
5. Step 5: Solve for x
   x = 1,762,081.93/2,115.30
6. Step 6: Final answer
   x = 833.02