Finding the Fourth Proportional to 215,096.54, 321,061.53 and 187,213.10

Step by Step Solution

1. Step 1: Write the proportion equation
   215,096.54 : 321,061.53 = 187,213.10 : x
2. Step 2: Convert to fraction form
   215,096.54/321,061.53 = 187,213.10/x
3. Step 3: Cross multiply
   215,096.54x = 321,061.53 × 187,213.10
4. Step 4: Simplify right side
   215,096.54x = 60,106,923,385.98
5. Step 5: Solve for x
   x = 60,106,923,385.98/215,096.54
6. Step 6: Final answer
   x = 279,441.61