Finding the Fourth Proportional to 139,424.14, 209,018.67 and 60,478.93

Step by Step Solution

1. Step 1: Write the proportion equation
   139,424.14 : 209,018.67 = 60,478.93 : x
2. Step 2: Convert to fraction form
   139,424.14/209,018.67 = 60,478.93/x
3. Step 3: Cross multiply
   139,424.14x = 209,018.67 × 60,478.93
4. Step 4: Simplify right side
   139,424.14x = 12,641,225,511.62
5. Step 5: Solve for x
   x = 12,641,225,511.62/139,424.14
6. Step 6: Final answer
   x = 90,667.41