Finding the Fourth Proportional to 1,915.36, 2,641.89 and 1,206.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,915.36 : 2,641.89 = 1,206.52 : x
2. Step 2: Convert to fraction form
   1,915.36/2,641.89 = 1,206.52/x
3. Step 3: Cross multiply
   1,915.36x = 2,641.89 × 1,206.52
4. Step 4: Simplify right side
   1,915.36x = 3,187,493.12
5. Step 5: Solve for x
   x = 3,187,493.12/1,915.36
6. Step 6: Final answer
   x = 1,664.17