Finding the Fourth Proportional to 139,399.56, 209,099.10 and 39,560.72

Step by Step Solution

1. Step 1: Write the proportion equation
   139,399.56 : 209,099.10 = 39,560.72 : x
2. Step 2: Convert to fraction form
   139,399.56/209,099.10 = 39,560.72/x
3. Step 3: Cross multiply
   139,399.56x = 209,099.10 × 39,560.72
4. Step 4: Simplify right side
   139,399.56x = 8,272,110,947.35
5. Step 5: Solve for x
   x = 8,272,110,947.35/139,399.56
6. Step 6: Final answer
   x = 59,341.01