Finding the Fourth Proportional to 1,070.88, 1,477.98 and 628.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.88 : 1,477.98 = 628.69 : x
2. Step 2: Convert to fraction form
   1,070.88/1,477.98 = 628.69/x
3. Step 3: Cross multiply
   1,070.88x = 1,477.98 × 628.69
4. Step 4: Simplify right side
   1,070.88x = 929,196.18
5. Step 5: Solve for x
   x = 929,196.18/1,070.88
6. Step 6: Final answer
   x = 867.70