Finding the Fourth Proportional to 85,928.55, 128,876.12 and 43,222.60

Step by Step Solution

1. Step 1: Write the proportion equation
   85,928.55 : 128,876.12 = 43,222.60 : x
2. Step 2: Convert to fraction form
   85,928.55/128,876.12 = 43,222.60/x
3. Step 3: Cross multiply
   85,928.55x = 128,876.12 × 43,222.60
4. Step 4: Simplify right side
   85,928.55x = 5,570,360,984.31
5. Step 5: Solve for x
   x = 5,570,360,984.31/85,928.55
6. Step 6: Final answer
   x = 64,825.50