Finding the Fourth Proportional to 1,284.48, 1,917.50 and 1,120.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.48 : 1,917.50 = 1,120.50 : x
2. Step 2: Convert to fraction form
   1,284.48/1,917.50 = 1,120.50/x
3. Step 3: Cross multiply
   1,284.48x = 1,917.50 × 1,120.50
4. Step 4: Simplify right side
   1,284.48x = 2,148,553.15
5. Step 5: Solve for x
   x = 2,148,553.15/1,284.48
6. Step 6: Final answer
   x = 1,672.70