Finding the Fourth Proportional to 261,570.20, 360,978.73 and 154,144.76

Step by Step Solution

1. Step 1: Write the proportion equation
   261,570.20 : 360,978.73 = 154,144.76 : x
2. Step 2: Convert to fraction form
   261,570.20/360,978.73 = 154,144.76/x
3. Step 3: Cross multiply
   261,570.20x = 360,978.73 × 154,144.76
4. Step 4: Simplify right side
   261,570.20x = 55,642,977,510.70
5. Step 5: Solve for x
   x = 55,642,977,510.70/261,570.20
6. Step 6: Final answer
   x = 212,726.75