Finding the Fourth Proportional to 99,365.94, 137,120.85 and 56,928.42

Step by Step Solution

1. Step 1: Write the proportion equation
   99,365.94 : 137,120.85 = 56,928.42 : x
2. Step 2: Convert to fraction form
   99,365.94/137,120.85 = 56,928.42/x
3. Step 3: Cross multiply
   99,365.94x = 137,120.85 × 56,928.42
4. Step 4: Simplify right side
   99,365.94x = 7,806,073,339.56
5. Step 5: Solve for x
   x = 7,806,073,339.56/99,365.94
6. Step 6: Final answer
   x = 78,558.84