Finding the Fourth Proportional to 139,731.29, 209,629.47 and 39,892.85

Step by Step Solution

1. Step 1: Write the proportion equation
   139,731.29 : 209,629.47 = 39,892.85 : x
2. Step 2: Convert to fraction form
   139,731.29/209,629.47 = 39,892.85/x
3. Step 3: Cross multiply
   139,731.29x = 209,629.47 × 39,892.85
4. Step 4: Simplify right side
   139,731.29x = 8,362,717,002.29
5. Step 5: Solve for x
   x = 8,362,717,002.29/139,731.29
6. Step 6: Final answer
   x = 59,848.56