Finding the Fourth Proportional to 2,123.60, 2,930.73 and 1,284.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.60 : 2,930.73 = 1,284.35 : x
2. Step 2: Convert to fraction form
   2,123.60/2,930.73 = 1,284.35/x
3. Step 3: Cross multiply
   2,123.60x = 2,930.73 × 1,284.35
4. Step 4: Simplify right side
   2,123.60x = 3,764,068.42
5. Step 5: Solve for x
   x = 3,764,068.42/2,123.60
6. Step 6: Final answer
   x = 1,772.50