Finding the Fourth Proportional to 2,390.81, 3,586.50 and 747.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,390.81 : 3,586.50 = 747.50 : x
2. Step 2: Convert to fraction form
   2,390.81/3,586.50 = 747.50/x
3. Step 3: Cross multiply
   2,390.81x = 3,586.50 × 747.50
4. Step 4: Simplify right side
   2,390.81x = 2,680,890.82
5. Step 5: Solve for x
   x = 2,680,890.82/2,390.81
6. Step 6: Final answer
   x = 1,121.33