Finding the Fourth Proportional to 272,438.72, 407,870.76 and 172,711.52

Step by Step Solution

1. Step 1: Write the proportion equation
   272,438.72 : 407,870.76 = 172,711.52 : x
2. Step 2: Convert to fraction form
   272,438.72/407,870.76 = 172,711.52/x
3. Step 3: Cross multiply
   272,438.72x = 407,870.76 × 172,711.52
4. Step 4: Simplify right side
   272,438.72x = 70,443,978,923.16
5. Step 5: Solve for x
   x = 70,443,978,923.16/272,438.72
6. Step 6: Final answer
   x = 258,568.16