Finding the Fourth Proportional to 1,087.34, 1,500.53 and 621.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.34 : 1,500.53 = 621.59 : x
2. Step 2: Convert to fraction form
   1,087.34/1,500.53 = 621.59/x
3. Step 3: Cross multiply
   1,087.34x = 1,500.53 × 621.59
4. Step 4: Simplify right side
   1,087.34x = 932,703.83
5. Step 5: Solve for x
   x = 932,703.83/1,087.34
6. Step 6: Final answer
   x = 857.79