Finding the Fourth Proportional to 423,145.89, 634,721.00 and 142,665.57

Step by Step Solution

1. Step 1: Write the proportion equation
   423,145.89 : 634,721.00 = 142,665.57 : x
2. Step 2: Convert to fraction form
   423,145.89/634,721.00 = 142,665.57/x
3. Step 3: Cross multiply
   423,145.89x = 634,721.00 × 142,665.57
4. Step 4: Simplify right side
   423,145.89x = 90,552,832,542.64
5. Step 5: Solve for x
   x = 90,552,832,542.64/423,145.89
6. Step 6: Final answer
   x = 213,999.08