Finding the Fourth Proportional to 40,348, 60,531.72 and 12,646

Step by Step Solution

1. Step 1: Write the proportion equation
   40,348 : 60,531.72 = 12,646 : x
2. Step 2: Convert to fraction form
   40,348/60,531.72 = 12,646/x
3. Step 3: Cross multiply
   40,348x = 60,531.72 × 12,646
4. Step 4: Simplify right side
   40,348x = 765,484,131.12
5. Step 5: Solve for x
   x = 765,484,131.12/40,348
6. Step 6: Final answer
   x = 18,972.05