Finding the Fourth Proportional to 80,421.30, 110,964.78 and 46,429.20

Step by Step Solution

1. Step 1: Write the proportion equation
   80,421.30 : 110,964.78 = 46,429.20 : x
2. Step 2: Convert to fraction form
   80,421.30/110,964.78 = 46,429.20/x
3. Step 3: Cross multiply
   80,421.30x = 110,964.78 × 46,429.20
4. Step 4: Simplify right side
   80,421.30x = 5,152,005,963.58
5. Step 5: Solve for x
   x = 5,152,005,963.58/80,421.30
6. Step 6: Final answer
   x = 64,062.70