Finding the Fourth Proportional to 22,985.50, 31,722.72 and 12,913.96

Step by Step Solution

1. Step 1: Write the proportion equation
   22,985.50 : 31,722.72 = 12,913.96 : x
2. Step 2: Convert to fraction form
   22,985.50/31,722.72 = 12,913.96/x
3. Step 3: Cross multiply
   22,985.50x = 31,722.72 × 12,913.96
4. Step 4: Simplify right side
   22,985.50x = 409,665,937.17
5. Step 5: Solve for x
   x = 409,665,937.17/22,985.50
6. Step 6: Final answer
   x = 17,822.80