Finding the Fourth Proportional to 1,018.58, 1,526.49 and 498.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.58 : 1,526.49 = 498.51 : x
2. Step 2: Convert to fraction form
   1,018.58/1,526.49 = 498.51/x
3. Step 3: Cross multiply
   1,018.58x = 1,526.49 × 498.51
4. Step 4: Simplify right side
   1,018.58x = 760,970.53
5. Step 5: Solve for x
   x = 760,970.53/1,018.58
6. Step 6: Final answer
   x = 747.09