Finding the Fourth Proportional to 1,171.98, 1,758.18 and 761.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,171.98 : 1,758.18 = 761.88 : x
2. Step 2: Convert to fraction form
   1,171.98/1,758.18 = 761.88/x
3. Step 3: Cross multiply
   1,171.98x = 1,758.18 × 761.88
4. Step 4: Simplify right side
   1,171.98x = 1,339,522.18
5. Step 5: Solve for x
   x = 1,339,522.18/1,171.98
6. Step 6: Final answer
   x = 1,142.96