Finding the Fourth Proportional to 139,902.42, 193,017.96 and 85,434.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,902.42 : 193,017.96 = 85,434.72 : x
2. Step 2: Convert to fraction form
   139,902.42/193,017.96 = 85,434.72/x
3. Step 3: Cross multiply
   139,902.42x = 193,017.96 × 85,434.72
4. Step 4: Simplify right side
   139,902.42x = 16,490,435,367.57
5. Step 5: Solve for x
   x = 16,490,435,367.57/139,902.42
6. Step 6: Final answer
   x = 117,870.98