Finding the Fourth Proportional to 139,901.42, 193,016.58 and 85,433.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,901.42 : 193,016.58 = 85,433.72 : x
2. Step 2: Convert to fraction form
   139,901.42/193,016.58 = 85,433.72/x
3. Step 3: Cross multiply
   139,901.42x = 193,016.58 × 85,433.72
4. Step 4: Simplify right side
   139,901.42x = 16,490,124,451.08
5. Step 5: Solve for x
   x = 16,490,124,451.08/139,901.42
6. Step 6: Final answer
   x = 117,869.60