Finding the Fourth Proportional to 139,766.42, 209,647.20 and 34,585.40

Step by Step Solution

1. Step 1: Write the proportion equation
   139,766.42 : 209,647.20 = 34,585.40 : x
2. Step 2: Convert to fraction form
   139,766.42/209,647.20 = 34,585.40/x
3. Step 3: Cross multiply
   139,766.42x = 209,647.20 × 34,585.40
4. Step 4: Simplify right side
   139,766.42x = 7,250,732,270.88
5. Step 5: Solve for x
   x = 7,250,732,270.88/139,766.42
6. Step 6: Final answer
   x = 51,877.50