Finding the Fourth Proportional to 22,906, 31,610.28 and 12,970

Step by Step Solution

1. Step 1: Write the proportion equation
   22,906 : 31,610.28 = 12,970 : x
2. Step 2: Convert to fraction form
   22,906/31,610.28 = 12,970/x
3. Step 3: Cross multiply
   22,906x = 31,610.28 × 12,970
4. Step 4: Simplify right side
   22,906x = 409,985,331.60
5. Step 5: Solve for x
   x = 409,985,331.60/22,906
6. Step 6: Final answer
   x = 17,898.60