Finding the Fourth Proportional to 31,145.67, 42,980.85 and 16,998.48

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.67 : 42,980.85 = 16,998.48 : x
2. Step 2: Convert to fraction form
   31,145.67/42,980.85 = 16,998.48/x
3. Step 3: Cross multiply
   31,145.67x = 42,980.85 × 16,998.48
4. Step 4: Simplify right side
   31,145.67x = 730,609,119.11
5. Step 5: Solve for x
   x = 730,609,119.11/31,145.67
6. Step 6: Final answer
   x = 23,457.81