Finding the Fourth Proportional to 427,023.46, 640,601.61 and 142,625.98

Step by Step Solution

1. Step 1: Write the proportion equation
   427,023.46 : 640,601.61 = 142,625.98 : x
2. Step 2: Convert to fraction form
   427,023.46/640,601.61 = 142,625.98/x
3. Step 3: Cross multiply
   427,023.46x = 640,601.61 × 142,625.98
4. Step 4: Simplify right side
   427,023.46x = 91,366,428,499.69
5. Step 5: Solve for x
   x = 91,366,428,499.69/427,023.46
6. Step 6: Final answer
   x = 213,961.15