Finding the Fourth Proportional to 1,916.89, 2,878.98 and 1,191.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,916.89 : 2,878.98 = 1,191.53 : x
2. Step 2: Convert to fraction form
   1,916.89/2,878.98 = 1,191.53/x
3. Step 3: Cross multiply
   1,916.89x = 2,878.98 × 1,191.53
4. Step 4: Simplify right side
   1,916.89x = 3,430,391.04
5. Step 5: Solve for x
   x = 3,430,391.04/1,916.89
6. Step 6: Final answer
   x = 1,789.56