Finding the Fourth Proportional to 1,139.46, 1,562.20 and 1,118.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.46 : 1,562.20 = 1,118.70 : x
2. Step 2: Convert to fraction form
   1,139.46/1,562.20 = 1,118.70/x
3. Step 3: Cross multiply
   1,139.46x = 1,562.20 × 1,118.70
4. Step 4: Simplify right side
   1,139.46x = 1,747,633.14
5. Step 5: Solve for x
   x = 1,747,633.14/1,139.46
6. Step 6: Final answer
   x = 1,533.74