Finding the Fourth Proportional to 253,503.42, 380,243.59 and 85,010.79

Step by Step Solution

1. Step 1: Write the proportion equation
   253,503.42 : 380,243.59 = 85,010.79 : x
2. Step 2: Convert to fraction form
   253,503.42/380,243.59 = 85,010.79/x
3. Step 3: Cross multiply
   253,503.42x = 380,243.59 × 85,010.79
4. Step 4: Simplify right side
   253,503.42x = 32,324,807,978.34
5. Step 5: Solve for x
   x = 32,324,807,978.34/253,503.42
6. Step 6: Final answer
   x = 127,512.32