Finding the Fourth Proportional to 139,776.59, 209,643.39 and 76,628.00

Step by Step Solution

1. Step 1: Write the proportion equation
   139,776.59 : 209,643.39 = 76,628.00 : x
2. Step 2: Convert to fraction form
   139,776.59/209,643.39 = 76,628.00/x
3. Step 3: Cross multiply
   139,776.59x = 209,643.39 × 76,628.00
4. Step 4: Simplify right side
   139,776.59x = 16,064,552,640.70
5. Step 5: Solve for x
   x = 16,064,552,640.70/139,776.59
6. Step 6: Final answer
   x = 114,930.21