Finding the Fourth Proportional to 1,915.63, 2,643.42 and 1,076.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.63 : 2,643.42 = 1,076.47 : x
2. Step 2: Convert to fraction form
   1,915.63/2,643.42 = 1,076.47/x
3. Step 3: Cross multiply
   1,915.63x = 2,643.42 × 1,076.47
4. Step 4: Simplify right side
   1,915.63x = 2,845,559.76
5. Step 5: Solve for x
   x = 2,845,559.76/1,915.63
6. Step 6: Final answer
   x = 1,485.45