Finding the Fourth Proportional to 139,366.15, 209,049.22 and 60,478.63

Step by Step Solution

1. Step 1: Write the proportion equation
   139,366.15 : 209,049.22 = 60,478.63 : x
2. Step 2: Convert to fraction form
   139,366.15/209,049.22 = 60,478.63/x
3. Step 3: Cross multiply
   139,366.15x = 209,049.22 × 60,478.63
4. Step 4: Simplify right side
   139,366.15x = 12,643,010,428.17
5. Step 5: Solve for x
   x = 12,643,010,428.17/139,366.15
6. Step 6: Final answer
   x = 90,717.94