Finding the Fourth Proportional to 139,472.83, 209,210.72 and 55,253.50

Step by Step Solution

1. Step 1: Write the proportion equation
   139,472.83 : 209,210.72 = 55,253.50 : x
2. Step 2: Convert to fraction form
   139,472.83/209,210.72 = 55,253.50/x
3. Step 3: Cross multiply
   139,472.83x = 209,210.72 × 55,253.50
4. Step 4: Simplify right side
   139,472.83x = 11,559,624,517.52
5. Step 5: Solve for x
   x = 11,559,624,517.52/139,472.83
6. Step 6: Final answer
   x = 82,880.83