Finding the Fourth Proportional to 1,113.89, 1,536.95 and 648.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,113.89 : 1,536.95 = 648.05 : x
2. Step 2: Convert to fraction form
   1,113.89/1,536.95 = 648.05/x
3. Step 3: Cross multiply
   1,113.89x = 1,536.95 × 648.05
4. Step 4: Simplify right side
   1,113.89x = 996,014.38
5. Step 5: Solve for x
   x = 996,014.38/1,113.89
6. Step 6: Final answer
   x = 894.18