Finding the Fourth Proportional to 1,931.08, 2,665.87 and 1,223.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.08 : 2,665.87 = 1,223.65 : x
2. Step 2: Convert to fraction form
   1,931.08/2,665.87 = 1,223.65/x
3. Step 3: Cross multiply
   1,931.08x = 2,665.87 × 1,223.65
4. Step 4: Simplify right side
   1,931.08x = 3,262,100.02
5. Step 5: Solve for x
   x = 3,262,100.02/1,931.08
6. Step 6: Final answer
   x = 1,689.27