Finding the Fourth Proportional to 2,084.70, 3,111.20 and 1,916.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,084.70 : 3,111.20 = 1,916.70 : x
2. Step 2: Convert to fraction form
   2,084.70/3,111.20 = 1,916.70/x
3. Step 3: Cross multiply
   2,084.70x = 3,111.20 × 1,916.70
4. Step 4: Simplify right side
   2,084.70x = 5,963,227.46
5. Step 5: Solve for x
   x = 5,963,227.46/2,084.70
6. Step 6: Final answer
   x = 2,860.47