Finding the Fourth Proportional to 22,978.08, 31,708.28 and 12,906.25

Step by Step Solution

1. Step 1: Write the proportion equation
   22,978.08 : 31,708.28 = 12,906.25 : x
2. Step 2: Convert to fraction form
   22,978.08/31,708.28 = 12,906.25/x
3. Step 3: Cross multiply
   22,978.08x = 31,708.28 × 12,906.25
4. Step 4: Simplify right side
   22,978.08x = 409,234,941.74
5. Step 5: Solve for x
   x = 409,234,941.74/22,978.08
6. Step 6: Final answer
   x = 17,809.80