Finding the Fourth Proportional to 1,070.87, 1,478.00 and 622.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.87 : 1,478.00 = 622.71 : x
2. Step 2: Convert to fraction form
   1,070.87/1,478.00 = 622.71/x
3. Step 3: Cross multiply
   1,070.87x = 1,478.00 × 622.71
4. Step 4: Simplify right side
   1,070.87x = 920,362.27
5. Step 5: Solve for x
   x = 920,362.27/1,070.87
6. Step 6: Final answer
   x = 859.46