Finding the Fourth Proportional to 139,673.12, 209,510.72 and 39,833.20

Step by Step Solution

1. Step 1: Write the proportion equation
   139,673.12 : 209,510.72 = 39,833.20 : x
2. Step 2: Convert to fraction form
   139,673.12/209,510.72 = 39,833.20/x
3. Step 3: Cross multiply
   139,673.12x = 209,510.72 × 39,833.20
4. Step 4: Simplify right side
   139,673.12x = 8,345,482,411.90
5. Step 5: Solve for x
   x = 8,345,482,411.90/139,673.12
6. Step 6: Final answer
   x = 59,750.10