Finding the Fourth Proportional to 1,355.19, 1,869.98 and 757.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.19 : 1,869.98 = 757.61 : x
2. Step 2: Convert to fraction form
   1,355.19/1,869.98 = 757.61/x
3. Step 3: Cross multiply
   1,355.19x = 1,869.98 × 757.61
4. Step 4: Simplify right side
   1,355.19x = 1,416,715.55
5. Step 5: Solve for x
   x = 1,416,715.55/1,355.19
6. Step 6: Final answer
   x = 1,045.40