Finding the Fourth Proportional to 31,138.08, 42,969.72 and 16,990.92

Step by Step Solution

1. Step 1: Write the proportion equation
   31,138.08 : 42,969.72 = 16,990.92 : x
2. Step 2: Convert to fraction form
   31,138.08/42,969.72 = 16,990.92/x
3. Step 3: Cross multiply
   31,138.08x = 42,969.72 × 16,990.92
4. Step 4: Simplify right side
   31,138.08x = 730,095,074.94
5. Step 5: Solve for x
   x = 730,095,074.94/31,138.08
6. Step 6: Final answer
   x = 23,447.02