Finding the Fourth Proportional to 2,123.34, 3,186.45 and 969.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.34 : 3,186.45 = 969.90 : x
2. Step 2: Convert to fraction form
   2,123.34/3,186.45 = 969.90/x
3. Step 3: Cross multiply
   2,123.34x = 3,186.45 × 969.90
4. Step 4: Simplify right side
   2,123.34x = 3,090,537.86
5. Step 5: Solve for x
   x = 3,090,537.86/2,123.34
6. Step 6: Final answer
   x = 1,455.51