Finding the Fourth Proportional to 1,341.80, 1,851.42 and 782.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,341.80 : 1,851.42 = 782.30 : x
2. Step 2: Convert to fraction form
   1,341.80/1,851.42 = 782.30/x
3. Step 3: Cross multiply
   1,341.80x = 1,851.42 × 782.30
4. Step 4: Simplify right side
   1,341.80x = 1,448,365.87
5. Step 5: Solve for x
   x = 1,448,365.87/1,341.80
6. Step 6: Final answer
   x = 1,079.42