Finding the Fourth Proportional to 1,386.49, 2,076.69 and 898.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.49 : 2,076.69 = 898.06 : x
2. Step 2: Convert to fraction form
   1,386.49/2,076.69 = 898.06/x
3. Step 3: Cross multiply
   1,386.49x = 2,076.69 × 898.06
4. Step 4: Simplify right side
   1,386.49x = 1,864,992.22
5. Step 5: Solve for x
   x = 1,864,992.22/1,386.49
6. Step 6: Final answer
   x = 1,345.12