Finding the Fourth Proportional to 139,474.71, 209,204.57 and 81,804.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139,474.71 : 209,204.57 = 81,804.06 : x
2. Step 2: Convert to fraction form
   139,474.71/209,204.57 = 81,804.06/x
3. Step 3: Cross multiply
   139,474.71x = 209,204.57 × 81,804.06
4. Step 4: Simplify right side
   139,474.71x = 17,113,783,401.06
5. Step 5: Solve for x
   x = 17,113,783,401.06/139,474.71
6. Step 6: Final answer
   x = 122,701.70