Finding the Fourth Proportional to 1,092.48, 1,507.78 and 620.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,092.48 : 1,507.78 = 620.42 : x
2. Step 2: Convert to fraction form
   1,092.48/1,507.78 = 620.42/x
3. Step 3: Cross multiply
   1,092.48x = 1,507.78 × 620.42
4. Step 4: Simplify right side
   1,092.48x = 935,451.55
5. Step 5: Solve for x
   x = 935,451.55/1,092.48
6. Step 6: Final answer
   x = 856.27