Finding the Fourth Proportional to 1,071.02, 1,478.05 and 628.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.02 : 1,478.05 = 628.91 : x
2. Step 2: Convert to fraction form
   1,071.02/1,478.05 = 628.91/x
3. Step 3: Cross multiply
   1,071.02x = 1,478.05 × 628.91
4. Step 4: Simplify right side
   1,071.02x = 929,565.32
5. Step 5: Solve for x
   x = 929,565.32/1,071.02
6. Step 6: Final answer
   x = 867.92