Finding the Fourth Proportional to 1,070.91, 1,477.71 and 628.73

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.91 : 1,477.71 = 628.73 : x
2. Step 2: Convert to fraction form
   1,070.91/1,477.71 = 628.73/x
3. Step 3: Cross multiply
   1,070.91x = 1,477.71 × 628.73
4. Step 4: Simplify right side
   1,070.91x = 929,073.22
5. Step 5: Solve for x
   x = 929,073.22/1,070.91
6. Step 6: Final answer
   x = 867.55