Finding the Fourth Proportional to 253,812.29, 380,450.52 and 85,172.72

Step by Step Solution

1. Step 1: Write the proportion equation
   253,812.29 : 380,450.52 = 85,172.72 : x
2. Step 2: Convert to fraction form
   253,812.29/380,450.52 = 85,172.72/x
3. Step 3: Cross multiply
   253,812.29x = 380,450.52 × 85,172.72
4. Step 4: Simplify right side
   253,812.29x = 32,404,003,711.56
5. Step 5: Solve for x
   x = 32,404,003,711.56/253,812.29
6. Step 6: Final answer
   x = 127,669.17