Finding the Fourth Proportional to 139,524.50, 193,050.88 and 121,656.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,524.50 : 193,050.88 = 121,656.72 : x
2. Step 2: Convert to fraction form
   139,524.50/193,050.88 = 121,656.72/x
3. Step 3: Cross multiply
   139,524.50x = 193,050.88 × 121,656.72
4. Step 4: Simplify right side
   139,524.50x = 23,485,936,853.91
5. Step 5: Solve for x
   x = 23,485,936,853.91/139,524.50
6. Step 6: Final answer
   x = 168,328.41