Finding the Fourth Proportional to 397,290.56, 548,271.72 and 216,014.72

Step by Step Solution

1. Step 1: Write the proportion equation
   397,290.56 : 548,271.72 = 216,014.72 : x
2. Step 2: Convert to fraction form
   397,290.56/548,271.72 = 216,014.72/x
3. Step 3: Cross multiply
   397,290.56x = 548,271.72 × 216,014.72
4. Step 4: Simplify right side
   397,290.56x = 118,434,762,079.72
5. Step 5: Solve for x
   x = 118,434,762,079.72/397,290.56
6. Step 6: Final answer
   x = 298,106.16