Finding the Fourth Proportional to 22,720.50, 31,354.29 and 12,784.50

Step by Step Solution

1. Step 1: Write the proportion equation
   22,720.50 : 31,354.29 = 12,784.50 : x
2. Step 2: Convert to fraction form
   22,720.50/31,354.29 = 12,784.50/x
3. Step 3: Cross multiply
   22,720.50x = 31,354.29 × 12,784.50
4. Step 4: Simplify right side
   22,720.50x = 400,848,920.51
5. Step 5: Solve for x
   x = 400,848,920.51/22,720.50
6. Step 6: Final answer
   x = 17,642.61