Finding the Fourth Proportional to 2,123.85, 2,931.53 and 1,284.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.85 : 2,931.53 = 1,284.56 : x
2. Step 2: Convert to fraction form
   2,123.85/2,931.53 = 1,284.56/x
3. Step 3: Cross multiply
   2,123.85x = 2,931.53 × 1,284.56
4. Step 4: Simplify right side
   2,123.85x = 3,765,705.10
5. Step 5: Solve for x
   x = 3,765,705.10/2,123.85
6. Step 6: Final answer
   x = 1,773.06