Finding the Fourth Proportional to 90,472.92, 135,669.78 and 37,128.30

Step by Step Solution

1. Step 1: Write the proportion equation
   90,472.92 : 135,669.78 = 37,128.30 : x
2. Step 2: Convert to fraction form
   90,472.92/135,669.78 = 37,128.30/x
3. Step 3: Cross multiply
   90,472.92x = 135,669.78 × 37,128.30
4. Step 4: Simplify right side
   90,472.92x = 5,037,188,292.77
5. Step 5: Solve for x
   x = 5,037,188,292.77/90,472.92
6. Step 6: Final answer
   x = 55,676.20