Finding the Fourth Proportional to 1,018.88, 1,405.98 and 570.67

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.88 : 1,405.98 = 570.67 : x
2. Step 2: Convert to fraction form
   1,018.88/1,405.98 = 570.67/x
3. Step 3: Cross multiply
   1,018.88x = 1,405.98 × 570.67
4. Step 4: Simplify right side
   1,018.88x = 802,350.61
5. Step 5: Solve for x
   x = 802,350.61/1,018.88
6. Step 6: Final answer
   x = 787.48