Finding the Fourth Proportional to 1,076.58, 1,485.69 and 622.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.58 : 1,485.69 = 622.38 : x
2. Step 2: Convert to fraction form
   1,076.58/1,485.69 = 622.38/x
3. Step 3: Cross multiply
   1,076.58x = 1,485.69 × 622.38
4. Step 4: Simplify right side
   1,076.58x = 924,663.74
5. Step 5: Solve for x
   x = 924,663.74/1,076.58
6. Step 6: Final answer
   x = 858.89