Finding the Fourth Proportional to 1,339.59, 1,848.57 and 779.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.59 : 1,848.57 = 779.99 : x
2. Step 2: Convert to fraction form
   1,339.59/1,848.57 = 779.99/x
3. Step 3: Cross multiply
   1,339.59x = 1,848.57 × 779.99
4. Step 4: Simplify right side
   1,339.59x = 1,441,856.87
5. Step 5: Solve for x
   x = 1,441,856.87/1,339.59
6. Step 6: Final answer
   x = 1,076.34