Finding the Fourth Proportional to 448,284.58, 672,423.52 and 128,436.72

Step by Step Solution

1. Step 1: Write the proportion equation
   448,284.58 : 672,423.52 = 128,436.72 : x
2. Step 2: Convert to fraction form
   448,284.58/672,423.52 = 128,436.72/x
3. Step 3: Cross multiply
   448,284.58x = 672,423.52 × 128,436.72
4. Step 4: Simplify right side
   448,284.58x = 86,363,871,359.65
5. Step 5: Solve for x
   x = 86,363,871,359.65/448,284.58
6. Step 6: Final answer
   x = 192,654.12