Finding the Fourth Proportional to 1,100.25, 1,518.35 and 1,007.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.25 : 1,518.35 = 1,007.30 : x
2. Step 2: Convert to fraction form
   1,100.25/1,518.35 = 1,007.30/x
3. Step 3: Cross multiply
   1,100.25x = 1,518.35 × 1,007.30
4. Step 4: Simplify right side
   1,100.25x = 1,529,432.71
5. Step 5: Solve for x
   x = 1,529,432.71/1,100.25
6. Step 6: Final answer
   x = 1,390.08