Finding the Fourth Proportional to 1,071.12, 1,477.98 and 628.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.12 : 1,477.98 = 628.98 : x
2. Step 2: Convert to fraction form
   1,071.12/1,477.98 = 628.98/x
3. Step 3: Cross multiply
   1,071.12x = 1,477.98 × 628.98
4. Step 4: Simplify right side
   1,071.12x = 929,619.86
5. Step 5: Solve for x
   x = 929,619.86/1,071.12
6. Step 6: Final answer
   x = 867.90