Finding the Fourth Proportional to 21,158.77, 31,740.89 and 7,112.74

Step by Step Solution

1. Step 1: Write the proportion equation
   21,158.77 : 31,740.89 = 7,112.74 : x
2. Step 2: Convert to fraction form
   21,158.77/31,740.89 = 7,112.74/x
3. Step 3: Cross multiply
   21,158.77x = 31,740.89 × 7,112.74
4. Step 4: Simplify right side
   21,158.77x = 225,764,662.37
5. Step 5: Solve for x
   x = 225,764,662.37/21,158.77
6. Step 6: Final answer
   x = 10,670.03