Finding the Fourth Proportional to 1,087.69, 1,501.01 and 621.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.69 : 1,501.01 = 621.94 : x
2. Step 2: Convert to fraction form
   1,087.69/1,501.01 = 621.94/x
3. Step 3: Cross multiply
   1,087.69x = 1,501.01 × 621.94
4. Step 4: Simplify right side
   1,087.69x = 933,538.16
5. Step 5: Solve for x
   x = 933,538.16/1,087.69
6. Step 6: Final answer
   x = 858.28