Finding the Fourth Proportional to 139,648.05, 209,565.63 and 49,687.29

Step by Step Solution

1. Step 1: Write the proportion equation
   139,648.05 : 209,565.63 = 49,687.29 : x
2. Step 2: Convert to fraction form
   139,648.05/209,565.63 = 49,687.29/x
3. Step 3: Cross multiply
   139,648.05x = 209,565.63 × 49,687.29
4. Step 4: Simplify right side
   139,648.05x = 10,412,748,231.84
5. Step 5: Solve for x
   x = 10,412,748,231.84/139,648.05
6. Step 6: Final answer
   x = 74,564.22