Finding the Fourth Proportional to 1,111.03, 1,533.32 and 645.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,111.03 : 1,533.32 = 645.25 : x
2. Step 2: Convert to fraction form
   1,111.03/1,533.32 = 645.25/x
3. Step 3: Cross multiply
   1,111.03x = 1,533.32 × 645.25
4. Step 4: Simplify right side
   1,111.03x = 989,374.73
5. Step 5: Solve for x
   x = 989,374.73/1,111.03
6. Step 6: Final answer
   x = 890.50