Finding the Fourth Proportional to 139,428.62, 209,111.52 and 39,586.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,428.62 : 209,111.52 = 39,586.76 : x
2. Step 2: Convert to fraction form
   139,428.62/209,111.52 = 39,586.76/x
3. Step 3: Cross multiply
   139,428.62x = 209,111.52 × 39,586.76
4. Step 4: Simplify right side
   139,428.62x = 8,278,047,555.48
5. Step 5: Solve for x
   x = 8,278,047,555.48/139,428.62
6. Step 6: Final answer
   x = 59,371.22