Finding the Fourth Proportional to 22,900.50, 31,602.69 and 12,964.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,900.50 : 31,602.69 = 12,964.50 : x
2. Step 2: Convert to fraction form
   22,900.50/31,602.69 = 12,964.50/x
3. Step 3: Cross multiply
   22,900.50x = 31,602.69 × 12,964.50
4. Step 4: Simplify right side
   22,900.50x = 409,713,074.51
5. Step 5: Solve for x
   x = 409,713,074.51/22,900.50
6. Step 6: Final answer
   x = 17,891.01