Finding the Fourth Proportional to 1,279.41, 1,765.89 and 782.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.41 : 1,765.89 = 782.34 : x
2. Step 2: Convert to fraction form
   1,279.41/1,765.89 = 782.34/x
3. Step 3: Cross multiply
   1,279.41x = 1,765.89 × 782.34
4. Step 4: Simplify right side
   1,279.41x = 1,381,526.38
5. Step 5: Solve for x
   x = 1,381,526.38/1,279.41
6. Step 6: Final answer
   x = 1,079.82