Finding the Fourth Proportional to 139,814.28, 209,638.47 and 55,529.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,814.28 : 209,638.47 = 55,529.10 : x
2. Step 2: Convert to fraction form
   139,814.28/209,638.47 = 55,529.10/x
3. Step 3: Cross multiply
   139,814.28x = 209,638.47 × 55,529.10
4. Step 4: Simplify right side
   139,814.28x = 11,641,035,564.48
5. Step 5: Solve for x
   x = 11,641,035,564.48/139,814.28
6. Step 6: Final answer
   x = 83,260.71