Finding the Fourth Proportional to 1,520.82, 2,290.98 and 1,138.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,520.82 : 2,290.98 = 1,138.50 : x
2. Step 2: Convert to fraction form
   1,520.82/2,290.98 = 1,138.50/x
3. Step 3: Cross multiply
   1,520.82x = 2,290.98 × 1,138.50
4. Step 4: Simplify right side
   1,520.82x = 2,608,280.73
5. Step 5: Solve for x
   x = 2,608,280.73/1,520.82
6. Step 6: Final answer
   x = 1,715.05