Finding the Fourth Proportional to 139,943.72, 209,948.38 and 55,709.04

Step by Step Solution

1. Step 1: Write the proportion equation
   139,943.72 : 209,948.38 = 55,709.04 : x
2. Step 2: Convert to fraction form
   139,943.72/209,948.38 = 55,709.04/x
3. Step 3: Cross multiply
   139,943.72x = 209,948.38 × 55,709.04
4. Step 4: Simplify right side
   139,943.72x = 11,696,022,699.36
5. Step 5: Solve for x
   x = 11,696,022,699.36/139,943.72
6. Step 6: Final answer
   x = 83,576.62