Finding the Fourth Proportional to 31,145.13, 42,980.32 and 16,997.98

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.13 : 42,980.32 = 16,997.98 : x
2. Step 2: Convert to fraction form
   31,145.13/42,980.32 = 16,997.98/x
3. Step 3: Cross multiply
   31,145.13x = 42,980.32 × 16,997.98
4. Step 4: Simplify right side
   31,145.13x = 730,578,493.26
5. Step 5: Solve for x
   x = 730,578,493.26/31,145.13
6. Step 6: Final answer
   x = 23,457.23