Finding the Fourth Proportional to 57,142.17, 85,718.89 and 19,697.31

Step by Step Solution

1. Step 1: Write the proportion equation
   57,142.17 : 85,718.89 = 19,697.31 : x
2. Step 2: Convert to fraction form
   57,142.17/85,718.89 = 19,697.31/x
3. Step 3: Cross multiply
   57,142.17x = 85,718.89 × 19,697.31
4. Step 4: Simplify right side
   57,142.17x = 1,688,431,499.94
5. Step 5: Solve for x
   x = 1,688,431,499.94/57,142.17
6. Step 6: Final answer
   x = 29,547.91