Finding the Fourth Proportional to 139,477.84, 209,218.22 and 55,258.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,477.84 : 209,218.22 = 55,258.50 : x
2. Step 2: Convert to fraction form
   139,477.84/209,218.22 = 55,258.50/x
3. Step 3: Cross multiply
   139,477.84x = 209,218.22 × 55,258.50
4. Step 4: Simplify right side
   139,477.84x = 11,561,085,009.87
5. Step 5: Solve for x
   x = 11,561,085,009.87/139,477.84
6. Step 6: Final answer
   x = 82,888.33