Finding the Fourth Proportional to 139,275.75, 208,913.68 and 76,061.30

Step by Step Solution

1. Step 1: Write the proportion equation
   139,275.75 : 208,913.68 = 76,061.30 : x
2. Step 2: Convert to fraction form
   139,275.75/208,913.68 = 76,061.30/x
3. Step 3: Cross multiply
   139,275.75x = 208,913.68 × 76,061.30
4. Step 4: Simplify right side
   139,275.75x = 15,890,245,139.09
5. Step 5: Solve for x
   x = 15,890,245,139.09/139,275.75
6. Step 6: Final answer
   x = 114,091.97