Finding the Fourth Proportional to 1,372.36, 1,893.99 and 782.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,372.36 : 1,893.99 = 782.88 : x
2. Step 2: Convert to fraction form
   1,372.36/1,893.99 = 782.88/x
3. Step 3: Cross multiply
   1,372.36x = 1,893.99 × 782.88
4. Step 4: Simplify right side
   1,372.36x = 1,482,766.89
5. Step 5: Solve for x
   x = 1,482,766.89/1,372.36
6. Step 6: Final answer
   x = 1,080.45