Finding the Fourth Proportional to 397,157.97, 548,081.67 and 215,870.31

Step by Step Solution

1. Step 1: Write the proportion equation
   397,157.97 : 548,081.67 = 215,870.31 : x
2. Step 2: Convert to fraction form
   397,157.97/548,081.67 = 215,870.31/x
3. Step 3: Cross multiply
   397,157.97x = 548,081.67 × 215,870.31
4. Step 4: Simplify right side
   397,157.97x = 118,314,560,008.22
5. Step 5: Solve for x
   x = 118,314,560,008.22/397,157.97
6. Step 6: Final answer
   x = 297,903.02