Finding the Fourth Proportional to 12,642.71, 18,962.77 and 7,948.49

Step by Step Solution

1. Step 1: Write the proportion equation
   12,642.71 : 18,962.77 = 7,948.49 : x
2. Step 2: Convert to fraction form
   12,642.71/18,962.77 = 7,948.49/x
3. Step 3: Cross multiply
   12,642.71x = 18,962.77 × 7,948.49
4. Step 4: Simplify right side
   12,642.71x = 150,725,387.72
5. Step 5: Solve for x
   x = 150,725,387.72/12,642.71
6. Step 6: Final answer
   x = 11,921.92