Finding the Fourth Proportional to 139,510.86, 209,342.25 and 60,624.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,510.86 : 209,342.25 = 60,624.78 : x
2. Step 2: Convert to fraction form
   139,510.86/209,342.25 = 60,624.78/x
3. Step 3: Cross multiply
   139,510.86x = 209,342.25 × 60,624.78
4. Step 4: Simplify right side
   139,510.86x = 12,691,327,850.96
5. Step 5: Solve for x
   x = 12,691,327,850.96/139,510.86
6. Step 6: Final answer
   x = 90,970.18