Finding the Fourth Proportional to 99,409.36, 137,188.71 and 56,976.10

Step by Step Solution

1. Step 1: Write the proportion equation
   99,409.36 : 137,188.71 = 56,976.10 : x
2. Step 2: Convert to fraction form
   99,409.36/137,188.71 = 56,976.10/x
3. Step 3: Cross multiply
   99,409.36x = 137,188.71 × 56,976.10
4. Step 4: Simplify right side
   99,409.36x = 7,816,477,659.83
5. Step 5: Solve for x
   x = 7,816,477,659.83/99,409.36
6. Step 6: Final answer
   x = 78,629.19