Finding the Fourth Proportional to 1,303.96, 1,799.72 and 861.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,303.96 : 1,799.72 = 861.88 : x
2. Step 2: Convert to fraction form
   1,303.96/1,799.72 = 861.88/x
3. Step 3: Cross multiply
   1,303.96x = 1,799.72 × 861.88
4. Step 4: Simplify right side
   1,303.96x = 1,551,142.67
5. Step 5: Solve for x
   x = 1,551,142.67/1,303.96
6. Step 6: Final answer
   x = 1,189.56