Finding the Fourth Proportional to 2,085.84, 3,126.33 and 930.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.84 : 3,126.33 = 930.78 : x
2. Step 2: Convert to fraction form
   2,085.84/3,126.33 = 930.78/x
3. Step 3: Cross multiply
   2,085.84x = 3,126.33 × 930.78
4. Step 4: Simplify right side
   2,085.84x = 2,909,925.44
5. Step 5: Solve for x
   x = 2,909,925.44/2,085.84
6. Step 6: Final answer
   x = 1,395.09