Finding the Fourth Proportional to 2,860.61, 3,954.86 and 2,113.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,860.61 : 3,954.86 = 2,113.38 : x
2. Step 2: Convert to fraction form
   2,860.61/3,954.86 = 2,113.38/x
3. Step 3: Cross multiply
   2,860.61x = 3,954.86 × 2,113.38
4. Step 4: Simplify right side
   2,860.61x = 8,358,111.46
5. Step 5: Solve for x
   x = 8,358,111.46/2,860.61
6. Step 6: Final answer
   x = 2,921.80