Finding the Fourth Proportional to 3,696.10, 5,100.32 and 2,123.90

Step by Step Solution

1. Step 1: Write the proportion equation
   3,696.10 : 5,100.32 = 2,123.90 : x
2. Step 2: Convert to fraction form
   3,696.10/5,100.32 = 2,123.90/x
3. Step 3: Cross multiply
   3,696.10x = 5,100.32 × 2,123.90
4. Step 4: Simplify right side
   3,696.10x = 10,832,569.65
5. Step 5: Solve for x
   x = 10,832,569.65/3,696.10
6. Step 6: Final answer
   x = 2,930.81