Finding the Fourth Proportional to 1,339.59, 1,848.50 and 780.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,339.59 : 1,848.50 = 780.02 : x
2. Step 2: Convert to fraction form
   1,339.59/1,848.50 = 780.02/x
3. Step 3: Cross multiply
   1,339.59x = 1,848.50 × 780.02
4. Step 4: Simplify right side
   1,339.59x = 1,441,853.83
5. Step 5: Solve for x
   x = 1,441,853.83/1,339.59
6. Step 6: Final answer
   x = 1,076.34