Finding the Fourth Proportional to 1,100.88, 1,647.81 and 612.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.88 : 1,647.81 = 612.45 : x
2. Step 2: Convert to fraction form
   1,100.88/1,647.81 = 612.45/x
3. Step 3: Cross multiply
   1,100.88x = 1,647.81 × 612.45
4. Step 4: Simplify right side
   1,100.88x = 1,009,201.23
5. Step 5: Solve for x
   x = 1,009,201.23/1,100.88
6. Step 6: Final answer
   x = 916.72