Finding the Fourth Proportional to 253,814.29, 380,453.52 and 85,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   253,814.29 : 380,453.52 = 85,174.72 : x
2. Step 2: Convert to fraction form
   253,814.29/380,453.52 = 85,174.72/x
3. Step 3: Cross multiply
   253,814.29x = 380,453.52 × 85,174.72
4. Step 4: Simplify right side
   253,814.29x = 32,405,020,136.75
5. Step 5: Solve for x
   x = 32,405,020,136.75/253,814.29
6. Step 6: Final answer
   x = 127,672.17