Finding the Fourth Proportional to 139,660.38, 209,492.52 and 39,820.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,660.38 : 209,492.52 = 39,820.58 : x
2. Step 2: Convert to fraction form
   139,660.38/209,492.52 = 39,820.58/x
3. Step 3: Cross multiply
   139,660.38x = 209,492.52 × 39,820.58
4. Step 4: Simplify right side
   139,660.38x = 8,342,112,695.50
5. Step 5: Solve for x
   x = 8,342,112,695.50/139,660.38
6. Step 6: Final answer
   x = 59,731.42