Finding the Fourth Proportional to 423,066.16, 634,601.42 and 142,585.84

Step by Step Solution

1. Step 1: Write the proportion equation
   423,066.16 : 634,601.42 = 142,585.84 : x
2. Step 2: Convert to fraction form
   423,066.16/634,601.42 = 142,585.84/x
3. Step 3: Cross multiply
   423,066.16x = 634,601.42 × 142,585.84
4. Step 4: Simplify right side
   423,066.16x = 90,485,176,535.89
5. Step 5: Solve for x
   x = 90,485,176,535.89/423,066.16
6. Step 6: Final answer
   x = 213,879.49