Finding the Fourth Proportional to 91,089.50, 136,634.25 and 28,760

Step by Step Solution

1. Step 1: Write the proportion equation
   91,089.50 : 136,634.25 = 28,760 : x
2. Step 2: Convert to fraction form
   91,089.50/136,634.25 = 28,760/x
3. Step 3: Cross multiply
   91,089.50x = 136,634.25 × 28,760
4. Step 4: Simplify right side
   91,089.50x = 3,929,601,030
5. Step 5: Solve for x
   x = 3,929,601,030/91,089.50
6. Step 6: Final answer
   x = 43,140