Finding the Fourth Proportional to 272,538.81, 408,825.50 and 85,557.69

Step by Step Solution

1. Step 1: Write the proportion equation
   272,538.81 : 408,825.50 = 85,557.69 : x
2. Step 2: Convert to fraction form
   272,538.81/408,825.50 = 85,557.69/x
3. Step 3: Cross multiply
   272,538.81x = 408,825.50 × 85,557.69
4. Step 4: Simplify right side
   272,538.81x = 34,978,164,965.31
5. Step 5: Solve for x
   x = 34,978,164,965.31/272,538.81
6. Step 6: Final answer
   x = 128,341.96