Finding the Fourth Proportional to 31,145.78, 42,980.72 and 16,997.69

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.78 : 42,980.72 = 16,997.69 : x
2. Step 2: Convert to fraction form
   31,145.78/42,980.72 = 16,997.69/x
3. Step 3: Cross multiply
   31,145.78x = 42,980.72 × 16,997.69
4. Step 4: Simplify right side
   31,145.78x = 730,572,654.64
5. Step 5: Solve for x
   x = 730,572,654.64/31,145.78
6. Step 6: Final answer
   x = 23,456.56