Finding the Fourth Proportional to 31,064.96, 42,870.56 and 16,918.40

Step by Step Solution

1. Step 1: Write the proportion equation
   31,064.96 : 42,870.56 = 16,918.40 : x
2. Step 2: Convert to fraction form
   31,064.96/42,870.56 = 16,918.40/x
3. Step 3: Cross multiply
   31,064.96x = 42,870.56 × 16,918.40
4. Step 4: Simplify right side
   31,064.96x = 725,301,282.30
5. Step 5: Solve for x
   x = 725,301,282.30/31,064.96
6. Step 6: Final answer
   x = 23,347.89