Finding the Fourth Proportional to 1,915.67, 2,643.27 and 1,129.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.67 : 2,643.27 = 1,129.52 : x
2. Step 2: Convert to fraction form
   1,915.67/2,643.27 = 1,129.52/x
3. Step 3: Cross multiply
   1,915.67x = 2,643.27 × 1,129.52
4. Step 4: Simplify right side
   1,915.67x = 2,985,626.33
5. Step 5: Solve for x
   x = 2,985,626.33/1,915.67
6. Step 6: Final answer
   x = 1,558.53