Finding the Fourth Proportional to 1,386.01, 1,911.89 and 826.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.01 : 1,911.89 = 826.30 : x
2. Step 2: Convert to fraction form
   1,386.01/1,911.89 = 826.30/x
3. Step 3: Cross multiply
   1,386.01x = 1,911.89 × 826.30
4. Step 4: Simplify right side
   1,386.01x = 1,579,781.02
5. Step 5: Solve for x
   x = 1,579,781.02/1,386.01
6. Step 6: Final answer
   x = 1,139.81