Finding the Fourth Proportional to 1,290.06, 1,780.35 and 848.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,290.06 : 1,780.35 = 848.22 : x
2. Step 2: Convert to fraction form
   1,290.06/1,780.35 = 848.22/x
3. Step 3: Cross multiply
   1,290.06x = 1,780.35 × 848.22
4. Step 4: Simplify right side
   1,290.06x = 1,510,128.48
5. Step 5: Solve for x
   x = 1,510,128.48/1,290.06
6. Step 6: Final answer
   x = 1,170.59