Finding the Fourth Proportional to 31,131.61, 42,961.56 and 16,984.45

Step by Step Solution

1. Step 1: Write the proportion equation
   31,131.61 : 42,961.56 = 16,984.45 : x
2. Step 2: Convert to fraction form
   31,131.61/42,961.56 = 16,984.45/x
3. Step 3: Cross multiply
   31,131.61x = 42,961.56 × 16,984.45
4. Step 4: Simplify right side
   31,131.61x = 729,678,457.75
5. Step 5: Solve for x
   x = 729,678,457.75/31,131.61
6. Step 6: Final answer
   x = 23,438.51