Finding the Fourth Proportional to 91,099.28, 136,648.86 and 28,769.78

Step by Step Solution

1. Step 1: Write the proportion equation
   91,099.28 : 136,648.86 = 28,769.78 : x
2. Step 2: Convert to fraction form
   91,099.28/136,648.86 = 28,769.78/x
3. Step 3: Cross multiply
   91,099.28x = 136,648.86 × 28,769.78
4. Step 4: Simplify right side
   91,099.28x = 3,931,357,639.45
5. Step 5: Solve for x
   x = 3,931,357,639.45/91,099.28
6. Step 6: Final answer
   x = 43,154.65