Finding the Fourth Proportional to 93,013.20, 128,376.72 and 55,280.16

Step by Step Solution

1. Step 1: Write the proportion equation
   93,013.20 : 128,376.72 = 55,280.16 : x
2. Step 2: Convert to fraction form
   93,013.20/128,376.72 = 55,280.16/x
3. Step 3: Cross multiply
   93,013.20x = 128,376.72 × 55,280.16
4. Step 4: Simplify right side
   93,013.20x = 7,096,685,621.88
5. Step 5: Solve for x
   x = 7,096,685,621.88/93,013.20
6. Step 6: Final answer
   x = 76,297.62