Finding the Fourth Proportional to 1,090.34, 1,504.50 and 624.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,090.34 : 1,504.50 = 624.50 : x
2. Step 2: Convert to fraction form
   1,090.34/1,504.50 = 624.50/x
3. Step 3: Cross multiply
   1,090.34x = 1,504.50 × 624.50
4. Step 4: Simplify right side
   1,090.34x = 939,560.25
5. Step 5: Solve for x
   x = 939,560.25/1,090.34
6. Step 6: Final answer
   x = 861.71