Finding the Fourth Proportional to 1,070.69, 1,477.04 and 622.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,070.69 : 1,477.04 = 622.55 : x
2. Step 2: Convert to fraction form
   1,070.69/1,477.04 = 622.55/x
3. Step 3: Cross multiply
   1,070.69x = 1,477.04 × 622.55
4. Step 4: Simplify right side
   1,070.69x = 919,531.83
5. Step 5: Solve for x
   x = 919,531.83/1,070.69
6. Step 6: Final answer
   x = 858.83