Finding the Fourth Proportional to 42,186, 63,289.58 and 12,603.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,186 : 63,289.58 = 12,603.72 : x
2. Step 2: Convert to fraction form
   42,186/63,289.58 = 12,603.72/x
3. Step 3: Cross multiply
   42,186x = 63,289.58 × 12,603.72
4. Step 4: Simplify right side
   42,186x = 797,684,145.24
5. Step 5: Solve for x
   x = 797,684,145.24/42,186
6. Step 6: Final answer
   x = 18,908.74