Finding the Fourth Proportional to 1,189.96, 1,781.72 and 841.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.96 : 1,781.72 = 841.86 : x
2. Step 2: Convert to fraction form
   1,189.96/1,781.72 = 841.86/x
3. Step 3: Cross multiply
   1,189.96x = 1,781.72 × 841.86
4. Step 4: Simplify right side
   1,189.96x = 1,499,958.80
5. Step 5: Solve for x
   x = 1,499,958.80/1,189.96
6. Step 6: Final answer
   x = 1,260.51