Finding the Fourth Proportional to 139,442.12, 209,188.29 and 50,820.02

Step by Step Solution

1. Step 1: Write the proportion equation
   139,442.12 : 209,188.29 = 50,820.02 : x
2. Step 2: Convert to fraction form
   139,442.12/209,188.29 = 50,820.02/x
3. Step 3: Cross multiply
   139,442.12x = 209,188.29 × 50,820.02
4. Step 4: Simplify right side
   139,442.12x = 10,630,953,081.57
5. Step 5: Solve for x
   x = 10,630,953,081.57/139,442.12
6. Step 6: Final answer
   x = 76,239.18