Finding the Fourth Proportional to 1,915.78, 2,643.86 and 1,159.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.78 : 2,643.86 = 1,159.80 : x
2. Step 2: Convert to fraction form
   1,915.78/2,643.86 = 1,159.80/x
3. Step 3: Cross multiply
   1,915.78x = 2,643.86 × 1,159.80
4. Step 4: Simplify right side
   1,915.78x = 3,066,348.83
5. Step 5: Solve for x
   x = 3,066,348.83/1,915.78
6. Step 6: Final answer
   x = 1,600.57