Finding the Fourth Proportional to 2,145.23, 3,216.00 and 912.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.23 : 3,216.00 = 912.47 : x
2. Step 2: Convert to fraction form
   2,145.23/3,216.00 = 912.47/x
3. Step 3: Cross multiply
   2,145.23x = 3,216.00 × 912.47
4. Step 4: Simplify right side
   2,145.23x = 2,934,490.86
5. Step 5: Solve for x
   x = 2,934,490.86/2,145.23
6. Step 6: Final answer
   x = 1,367.91