Finding the Fourth Proportional to 1,680.86, 2,321.76 and 1,368.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,680.86 : 2,321.76 = 1,368.20 : x
2. Step 2: Convert to fraction form
   1,680.86/2,321.76 = 1,368.20/x
3. Step 3: Cross multiply
   1,680.86x = 2,321.76 × 1,368.20
4. Step 4: Simplify right side
   1,680.86x = 3,176,632.03
5. Step 5: Solve for x
   x = 3,176,632.03/1,680.86
6. Step 6: Final answer
   x = 1,889.88