Finding the Fourth Proportional to 31,038.67, 42,832.96 and 16,891.21

Step by Step Solution

1. Step 1: Write the proportion equation
   31,038.67 : 42,832.96 = 16,891.21 : x
2. Step 2: Convert to fraction form
   31,038.67/42,832.96 = 16,891.21/x
3. Step 3: Cross multiply
   31,038.67x = 42,832.96 × 16,891.21
4. Step 4: Simplify right side
   31,038.67x = 723,500,522.28
5. Step 5: Solve for x
   x = 723,500,522.28/31,038.67
6. Step 6: Final answer
   x = 23,309.65