Finding the Fourth Proportional to 139,817.76, 209,724.88 and 51,070.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,817.76 : 209,724.88 = 51,070.24 : x
2. Step 2: Convert to fraction form
   139,817.76/209,724.88 = 51,070.24/x
3. Step 3: Cross multiply
   139,817.76x = 209,724.88 × 51,070.24
4. Step 4: Simplify right side
   139,817.76x = 10,710,699,955.57
5. Step 5: Solve for x
   x = 10,710,699,955.57/139,817.76
6. Step 6: Final answer
   x = 76,604.72