Finding the Fourth Proportional to 91,087.50, 136,631.25 and 28,758

Step by Step Solution

1. Step 1: Write the proportion equation
   91,087.50 : 136,631.25 = 28,758 : x
2. Step 2: Convert to fraction form
   91,087.50/136,631.25 = 28,758/x
3. Step 3: Cross multiply
   91,087.50x = 136,631.25 × 28,758
4. Step 4: Simplify right side
   91,087.50x = 3,929,241,487.50
5. Step 5: Solve for x
   x = 3,929,241,487.50/91,087.50
6. Step 6: Final answer
   x = 43,137