Finding the Fourth Proportional to 1,513.35, 2,086.56 and 1,139.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.35 : 2,086.56 = 1,139.13 : x
2. Step 2: Convert to fraction form
   1,513.35/2,086.56 = 1,139.13/x
3. Step 3: Cross multiply
   1,513.35x = 2,086.56 × 1,139.13
4. Step 4: Simplify right side
   1,513.35x = 2,376,863.09
5. Step 5: Solve for x
   x = 2,376,863.09/1,513.35
6. Step 6: Final answer
   x = 1,570.60