Finding the Fourth Proportional to 1,279.58, 1,918.86 and 499.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,279.58 : 1,918.86 = 499.46 : x
2. Step 2: Convert to fraction form
   1,279.58/1,918.86 = 499.46/x
3. Step 3: Cross multiply
   1,279.58x = 1,918.86 × 499.46
4. Step 4: Simplify right side
   1,279.58x = 958,393.82
5. Step 5: Solve for x
   x = 958,393.82/1,279.58
6. Step 6: Final answer
   x = 748.99