Finding the Fourth Proportional to 22,931, 31,644.78 and 13,505.36

Step by Step Solution

1. Step 1: Write the proportion equation
   22,931 : 31,644.78 = 13,505.36 : x
2. Step 2: Convert to fraction form
   22,931/31,644.78 = 13,505.36/x
3. Step 3: Cross multiply
   22,931x = 31,644.78 × 13,505.36
4. Step 4: Simplify right side
   22,931x = 427,374,146.02
5. Step 5: Solve for x
   x = 427,374,146.02/22,931
6. Step 6: Final answer
   x = 18,637.40