Finding the Fourth Proportional to 2,117.86, 3,174.96 and 1,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.86 : 3,174.96 = 1,020.72 : x
2. Step 2: Convert to fraction form
   2,117.86/3,174.96 = 1,020.72/x
3. Step 3: Cross multiply
   2,117.86x = 3,174.96 × 1,020.72
4. Step 4: Simplify right side
   2,117.86x = 3,240,745.17
5. Step 5: Solve for x
   x = 3,240,745.17/2,117.86
6. Step 6: Final answer
   x = 1,530.20