Finding the Fourth Proportional to 1,172.69, 1,618.54 and 753.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.69 : 1,618.54 = 753.57 : x
2. Step 2: Convert to fraction form
   1,172.69/1,618.54 = 753.57/x
3. Step 3: Cross multiply
   1,172.69x = 1,618.54 × 753.57
4. Step 4: Simplify right side
   1,172.69x = 1,219,679.89
5. Step 5: Solve for x
   x = 1,219,679.89/1,172.69
6. Step 6: Final answer
   x = 1,040.07