Finding the Fourth Proportional to 426,498.04, 639,533.22 and 142,088.68

Step by Step Solution

1. Step 1: Write the proportion equation
   426,498.04 : 639,533.22 = 142,088.68 : x
2. Step 2: Convert to fraction form
   426,498.04/639,533.22 = 142,088.68/x
3. Step 3: Cross multiply
   426,498.04x = 639,533.22 × 142,088.68
4. Step 4: Simplify right side
   426,498.04x = 90,870,431,045.95
5. Step 5: Solve for x
   x = 90,870,431,045.95/426,498.04
6. Step 6: Final answer
   x = 213,061.78