Finding the Fourth Proportional to 31,145.88, 42,980.72 and 16,998.82

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.88 : 42,980.72 = 16,998.82 : x
2. Step 2: Convert to fraction form
   31,145.88/42,980.72 = 16,998.82/x
3. Step 3: Cross multiply
   31,145.88x = 42,980.72 × 16,998.82
4. Step 4: Simplify right side
   31,145.88x = 730,621,522.75
5. Step 5: Solve for x
   x = 730,621,522.75/31,145.88
6. Step 6: Final answer
   x = 23,458.05