Finding the Fourth Proportional to 1,172.58, 1,758.18 and 999.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,172.58 : 1,758.18 = 999.34 : x
2. Step 2: Convert to fraction form
   1,172.58/1,758.18 = 999.34/x
3. Step 3: Cross multiply
   1,172.58x = 1,758.18 × 999.34
4. Step 4: Simplify right side
   1,172.58x = 1,757,019.60
5. Step 5: Solve for x
   x = 1,757,019.60/1,172.58
6. Step 6: Final answer
   x = 1,498.42