Finding the Fourth Proportional to 91,245.57, 136,873.22 and 28,920.93

Step by Step Solution

1. Step 1: Write the proportion equation
   91,245.57 : 136,873.22 = 28,920.93 : x
2. Step 2: Convert to fraction form
   91,245.57/136,873.22 = 28,920.93/x
3. Step 3: Cross multiply
   91,245.57x = 136,873.22 × 28,920.93
4. Step 4: Simplify right side
   91,245.57x = 3,958,500,669.89
5. Step 5: Solve for x
   x = 3,958,500,669.89/91,245.57
6. Step 6: Final answer
   x = 43,382.94