Finding the Fourth Proportional to 1,728.76, 2,386.80 and 1,336.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.76 : 2,386.80 = 1,336.72 : x
2. Step 2: Convert to fraction form
   1,728.76/2,386.80 = 1,336.72/x
3. Step 3: Cross multiply
   1,728.76x = 2,386.80 × 1,336.72
4. Step 4: Simplify right side
   1,728.76x = 3,190,483.30
5. Step 5: Solve for x
   x = 3,190,483.30/1,728.76
6. Step 6: Final answer
   x = 1,845.53