Finding the Fourth Proportional to 1,047.42, 1,445.46 and 627.84

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.42 : 1,445.46 = 627.84 : x
2. Step 2: Convert to fraction form
   1,047.42/1,445.46 = 627.84/x
3. Step 3: Cross multiply
   1,047.42x = 1,445.46 × 627.84
4. Step 4: Simplify right side
   1,047.42x = 907,517.61
5. Step 5: Solve for x
   x = 907,517.61/1,047.42
6. Step 6: Final answer
   x = 866.43