Finding the Fourth Proportional to 1,123.80, 1,551.72 and 1,012.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,123.80 : 1,551.72 = 1,012.84 : x
2. Step 2: Convert to fraction form
   1,123.80/1,551.72 = 1,012.84/x
3. Step 3: Cross multiply
   1,123.80x = 1,551.72 × 1,012.84
4. Step 4: Simplify right side
   1,123.80x = 1,571,644.08
5. Step 5: Solve for x
   x = 1,571,644.08/1,123.80
6. Step 6: Final answer
   x = 1,398.51