Finding the Fourth Proportional to 3,695.78, 5,100.18 and 2,123.75

Step by Step Solution

1. Step 1: Write the proportion equation
   3,695.78 : 5,100.18 = 2,123.75 : x
2. Step 2: Convert to fraction form
   3,695.78/5,100.18 = 2,123.75/x
3. Step 3: Cross multiply
   3,695.78x = 5,100.18 × 2,123.75
4. Step 4: Simplify right side
   3,695.78x = 10,831,507.28
5. Step 5: Solve for x
   x = 10,831,507.28/3,695.78
6. Step 6: Final answer
   x = 2,930.78