Finding the Fourth Proportional to 1,100.61, 1,642.10 and 1,018.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.61 : 1,642.10 = 1,018.60 : x
2. Step 2: Convert to fraction form
   1,100.61/1,642.10 = 1,018.60/x
3. Step 3: Cross multiply
   1,100.61x = 1,642.10 × 1,018.60
4. Step 4: Simplify right side
   1,100.61x = 1,672,633.86
5. Step 5: Solve for x
   x = 1,672,633.86/1,100.61
6. Step 6: Final answer
   x = 1,519.73