Finding the Fourth Proportional to 31,137.90, 42,970.41 and 16,990.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,137.90 : 42,970.41 = 16,990.98 : x
2. Step 2: Convert to fraction form
   31,137.90/42,970.41 = 16,990.98/x
3. Step 3: Cross multiply
   31,137.90x = 42,970.41 × 16,990.98
4. Step 4: Simplify right side
   31,137.90x = 730,109,376.90
5. Step 5: Solve for x
   x = 730,109,376.90/31,137.90
6. Step 6: Final answer
   x = 23,447.61