Finding the Fourth Proportional to 139,419.98, 209,012.42 and 60,474.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139,419.98 : 209,012.42 = 60,474.78 : x
2. Step 2: Convert to fraction form
   139,419.98/209,012.42 = 60,474.78/x
3. Step 3: Cross multiply
   139,419.98x = 209,012.42 × 60,474.78
4. Step 4: Simplify right side
   139,419.98x = 12,639,980,116.77
5. Step 5: Solve for x
   x = 12,639,980,116.77/139,419.98
6. Step 6: Final answer
   x = 90,661.18