Finding the Fourth Proportional to 1,100.76, 1,647.86 and 841.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.76 : 1,647.86 = 841.72 : x
2. Step 2: Convert to fraction form
   1,100.76/1,647.86 = 841.72/x
3. Step 3: Cross multiply
   1,100.76x = 1,647.86 × 841.72
4. Step 4: Simplify right side
   1,100.76x = 1,387,036.72
5. Step 5: Solve for x
   x = 1,387,036.72/1,100.76
6. Step 6: Final answer
   x = 1,260.07