Finding the Fourth Proportional to 139,876.92, 209,665.99 and 79,776.00

Step by Step Solution

1. Step 1: Write the proportion equation
   139,876.92 : 209,665.99 = 79,776.00 : x
2. Step 2: Convert to fraction form
   139,876.92/209,665.99 = 79,776.00/x
3. Step 3: Cross multiply
   139,876.92x = 209,665.99 × 79,776.00
4. Step 4: Simplify right side
   139,876.92x = 16,726,314,337.83
5. Step 5: Solve for x
   x = 16,726,314,337.83/139,876.92
6. Step 6: Final answer
   x = 119,578.80