Finding the Fourth Proportional to 1,667.96, 2,501.31 and 557.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,667.96 : 2,501.31 = 557.15 : x
2. Step 2: Convert to fraction form
   1,667.96/2,501.31 = 557.15/x
3. Step 3: Cross multiply
   1,667.96x = 2,501.31 × 557.15
4. Step 4: Simplify right side
   1,667.96x = 1,393,604.87
5. Step 5: Solve for x
   x = 1,393,604.87/1,667.96
6. Step 6: Final answer
   x = 835.51