Finding the Fourth Proportional to 1,018.74, 1,405.86 and 552.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.74 : 1,405.86 = 552.99 : x
2. Step 2: Convert to fraction form
   1,018.74/1,405.86 = 552.99/x
3. Step 3: Cross multiply
   1,018.74x = 1,405.86 × 552.99
4. Step 4: Simplify right side
   1,018.74x = 777,429.72
5. Step 5: Solve for x
   x = 777,429.72/1,018.74
6. Step 6: Final answer
   x = 763.13