Finding the Fourth Proportional to 1,025.30, 1,539.15 and 1,018.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.30 : 1,539.15 = 1,018.10 : x
2. Step 2: Convert to fraction form
   1,025.30/1,539.15 = 1,018.10/x
3. Step 3: Cross multiply
   1,025.30x = 1,539.15 × 1,018.10
4. Step 4: Simplify right side
   1,025.30x = 1,567,008.62
5. Step 5: Solve for x
   x = 1,567,008.62/1,025.30
6. Step 6: Final answer
   x = 1,528.34