Finding the Fourth Proportional to 1,511.38, 2,085.71 and 913.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,511.38 : 2,085.71 = 913.89 : x
2. Step 2: Convert to fraction form
   1,511.38/2,085.71 = 913.89/x
3. Step 3: Cross multiply
   1,511.38x = 2,085.71 × 913.89
4. Step 4: Simplify right side
   1,511.38x = 1,906,109.51
5. Step 5: Solve for x
   x = 1,906,109.51/1,511.38
6. Step 6: Final answer
   x = 1,261.17