Finding the Fourth Proportional to 1,915.84, 2,643.55 and 1,076.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.84 : 2,643.55 = 1,076.50 : x
2. Step 2: Convert to fraction form
   1,915.84/2,643.55 = 1,076.50/x
3. Step 3: Cross multiply
   1,915.84x = 2,643.55 × 1,076.50
4. Step 4: Simplify right side
   1,915.84x = 2,845,781.58
5. Step 5: Solve for x
   x = 2,845,781.58/1,915.84
6. Step 6: Final answer
   x = 1,485.40