Finding the Fourth Proportional to 31,066.24, 42,870.90 and 16,918.78

Step by Step Solution

1. Step 1: Write the proportion equation
   31,066.24 : 42,870.90 = 16,918.78 : x
2. Step 2: Convert to fraction form
   31,066.24/42,870.90 = 16,918.78/x
3. Step 3: Cross multiply
   31,066.24x = 42,870.90 × 16,918.78
4. Step 4: Simplify right side
   31,066.24x = 725,323,325.50
5. Step 5: Solve for x
   x = 725,323,325.50/31,066.24
6. Step 6: Final answer
   x = 23,347.64