Finding the Fourth Proportional to 198,772.80, 298,188.72 and 65,667.12

Step by Step Solution

1. Step 1: Write the proportion equation
   198,772.80 : 298,188.72 = 65,667.12 : x
2. Step 2: Convert to fraction form
   198,772.80/298,188.72 = 65,667.12/x
3. Step 3: Cross multiply
   198,772.80x = 298,188.72 × 65,667.12
4. Step 4: Simplify right side
   198,772.80x = 19,581,194,458.89
5. Step 5: Solve for x
   x = 19,581,194,458.89/198,772.80
6. Step 6: Final answer
   x = 98,510.43