Finding the Fourth Proportional to 42,100.45, 63,150.13 and 12,115.48

Step by Step Solution

1. Step 1: Write the proportion equation
   42,100.45 : 63,150.13 = 12,115.48 : x
2. Step 2: Convert to fraction form
   42,100.45/63,150.13 = 12,115.48/x
3. Step 3: Cross multiply
   42,100.45x = 63,150.13 × 12,115.48
4. Step 4: Simplify right side
   42,100.45x = 765,094,137.01
5. Step 5: Solve for x
   x = 765,094,137.01/42,100.45
6. Step 6: Final answer
   x = 18,173.06