Finding the Fourth Proportional to 85,469.19, 128,219.28 and 42,796.88

Step by Step Solution

1. Step 1: Write the proportion equation
   85,469.19 : 128,219.28 = 42,796.88 : x
2. Step 2: Convert to fraction form
   85,469.19/128,219.28 = 42,796.88/x
3. Step 3: Cross multiply
   85,469.19x = 128,219.28 × 42,796.88
4. Step 4: Simplify right side
   85,469.19x = 5,487,384,498.75
5. Step 5: Solve for x
   x = 5,487,384,498.75/85,469.19
6. Step 6: Final answer
   x = 64,203.07