Finding the Fourth Proportional to 1,915.55, 2,643.39 and 1,170.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.55 : 2,643.39 = 1,170.76 : x
2. Step 2: Convert to fraction form
   1,915.55/2,643.39 = 1,170.76/x
3. Step 3: Cross multiply
   1,915.55x = 2,643.39 × 1,170.76
4. Step 4: Simplify right side
   1,915.55x = 3,094,768.67
5. Step 5: Solve for x
   x = 3,094,768.67/1,915.55
6. Step 6: Final answer
   x = 1,615.60