Finding the Fourth Proportional to 139,475.84, 209,215.22 and 55,256.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,475.84 : 209,215.22 = 55,256.50 : x
2. Step 2: Convert to fraction form
   139,475.84/209,215.22 = 55,256.50/x
3. Step 3: Cross multiply
   139,475.84x = 209,215.22 × 55,256.50
4. Step 4: Simplify right side
   139,475.84x = 11,560,500,803.93
5. Step 5: Solve for x
   x = 11,560,500,803.93/139,475.84
6. Step 6: Final answer
   x = 82,885.33