Finding the Fourth Proportional to 22,171.86, 30,602.42 and 12,745.90

Step by Step Solution

1. Step 1: Write the proportion equation
   22,171.86 : 30,602.42 = 12,745.90 : x
2. Step 2: Convert to fraction form
   22,171.86/30,602.42 = 12,745.90/x
3. Step 3: Cross multiply
   22,171.86x = 30,602.42 × 12,745.90
4. Step 4: Simplify right side
   22,171.86x = 390,055,385.08
5. Step 5: Solve for x
   x = 390,055,385.08/22,171.86
6. Step 6: Final answer
   x = 17,592.36