Finding the Fourth Proportional to 22,443.64, 30,972.54 and 12,885.10

Step by Step Solution

1. Step 1: Write the proportion equation
   22,443.64 : 30,972.54 = 12,885.10 : x
2. Step 2: Convert to fraction form
   22,443.64/30,972.54 = 12,885.10/x
3. Step 3: Cross multiply
   22,443.64x = 30,972.54 × 12,885.10
4. Step 4: Simplify right side
   22,443.64x = 399,084,275.15
5. Step 5: Solve for x
   x = 399,084,275.15/22,443.64
6. Step 6: Final answer
   x = 17,781.62