Finding the Fourth Proportional to 22,810.77, 31,479.53 and 12,739.05

Step by Step Solution

1. Step 1: Write the proportion equation
   22,810.77 : 31,479.53 = 12,739.05 : x
2. Step 2: Convert to fraction form
   22,810.77/31,479.53 = 12,739.05/x
3. Step 3: Cross multiply
   22,810.77x = 31,479.53 × 12,739.05
4. Step 4: Simplify right side
   22,810.77x = 401,019,242.95
5. Step 5: Solve for x
   x = 401,019,242.95/22,810.77
6. Step 6: Final answer
   x = 17,580.26