Finding the Fourth Proportional to 57,172.86, 78,895.62 and 31,678.56

Step by Step Solution

1. Step 1: Write the proportion equation
   57,172.86 : 78,895.62 = 31,678.56 : x
2. Step 2: Convert to fraction form
   57,172.86/78,895.62 = 31,678.56/x
3. Step 3: Cross multiply
   57,172.86x = 78,895.62 × 31,678.56
4. Step 4: Simplify right side
   57,172.86x = 2,499,299,631.91
5. Step 5: Solve for x
   x = 2,499,299,631.91/57,172.86
6. Step 6: Final answer
   x = 43,714.79