Finding the Fourth Proportional to 1,019.95, 1,406.58 and 646.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.95 : 1,406.58 = 646.27 : x
2. Step 2: Convert to fraction form
   1,019.95/1,406.58 = 646.27/x
3. Step 3: Cross multiply
   1,019.95x = 1,406.58 × 646.27
4. Step 4: Simplify right side
   1,019.95x = 909,030.46
5. Step 5: Solve for x
   x = 909,030.46/1,019.95
6. Step 6: Final answer
   x = 891.25