Finding the Fourth Proportional to 91,200.81, 136,822.29 and 28,871.31

Step by Step Solution

1. Step 1: Write the proportion equation
   91,200.81 : 136,822.29 = 28,871.31 : x
2. Step 2: Convert to fraction form
   91,200.81/136,822.29 = 28,871.31/x
3. Step 3: Cross multiply
   91,200.81x = 136,822.29 × 28,871.31
4. Step 4: Simplify right side
   91,200.81x = 3,950,238,749.50
5. Step 5: Solve for x
   x = 3,950,238,749.50/91,200.81
6. Step 6: Final answer
   x = 43,313.64