Finding the Fourth Proportional to 139,870.80, 209,572.92 and 98,243.28

Step by Step Solution

1. Step 1: Write the proportion equation
   139,870.80 : 209,572.92 = 98,243.28 : x
2. Step 2: Convert to fraction form
   139,870.80/209,572.92 = 98,243.28/x
3. Step 3: Cross multiply
   139,870.80x = 209,572.92 × 98,243.28
4. Step 4: Simplify right side
   139,870.80x = 20,589,131,059.98
5. Step 5: Solve for x
   x = 20,589,131,059.98/139,870.80
6. Step 6: Final answer
   x = 147,201.07