Finding the Fourth Proportional to 1,379.55, 1,903.74 and 782.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,379.55 : 1,903.74 = 782.10 : x
2. Step 2: Convert to fraction form
   1,379.55/1,903.74 = 782.10/x
3. Step 3: Cross multiply
   1,379.55x = 1,903.74 × 782.10
4. Step 4: Simplify right side
   1,379.55x = 1,488,920.58
5. Step 5: Solve for x
   x = 1,488,920.58/1,379.55
6. Step 6: Final answer
   x = 1,079.28