Finding the Fourth Proportional to 2,113.31, 2,916.38 and 1,181.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,113.31 : 2,916.38 = 1,181.81 : x
2. Step 2: Convert to fraction form
   2,113.31/2,916.38 = 1,181.81/x
3. Step 3: Cross multiply
   2,113.31x = 2,916.38 × 1,181.81
4. Step 4: Simplify right side
   2,113.31x = 3,446,617.29
5. Step 5: Solve for x
   x = 3,446,617.29/2,113.31
6. Step 6: Final answer
   x = 1,630.91