Finding the Fourth Proportional to 22,810.84, 31,478.65 and 12,739.46

Step by Step Solution

1. Step 1: Write the proportion equation
   22,810.84 : 31,478.65 = 12,739.46 : x
2. Step 2: Convert to fraction form
   22,810.84/31,478.65 = 12,739.46/x
3. Step 3: Cross multiply
   22,810.84x = 31,478.65 × 12,739.46
4. Step 4: Simplify right side
   22,810.84x = 401,021,002.53
5. Step 5: Solve for x
   x = 401,021,002.53/22,810.84
6. Step 6: Final answer
   x = 17,580.28