Finding the Fourth Proportional to 1,298.80, 1,790.96 and 1,112.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.80 : 1,790.96 = 1,112.88 : x
2. Step 2: Convert to fraction form
   1,298.80/1,790.96 = 1,112.88/x
3. Step 3: Cross multiply
   1,298.80x = 1,790.96 × 1,112.88
4. Step 4: Simplify right side
   1,298.80x = 1,993,123.56
5. Step 5: Solve for x
   x = 1,993,123.56/1,298.80
6. Step 6: Final answer
   x = 1,534.59