Finding the Fourth Proportional to 85,520.08, 128,211.86 and 42,797.21

Step by Step Solution

1. Step 1: Write the proportion equation
   85,520.08 : 128,211.86 = 42,797.21 : x
2. Step 2: Convert to fraction form
   85,520.08/128,211.86 = 42,797.21/x
3. Step 3: Cross multiply
   85,520.08x = 128,211.86 × 42,797.21
4. Step 4: Simplify right side
   85,520.08x = 5,487,110,084.04
5. Step 5: Solve for x
   x = 5,487,110,084.04/85,520.08
6. Step 6: Final answer
   x = 64,161.66