Finding the Fourth Proportional to 423,058.89, 634,590.50 and 142,578.57

Step by Step Solution

1. Step 1: Write the proportion equation
   423,058.89 : 634,590.50 = 142,578.57 : x
2. Step 2: Convert to fraction form
   423,058.89/634,590.50 = 142,578.57/x
3. Step 3: Cross multiply
   423,058.89x = 634,590.50 × 142,578.57
4. Step 4: Simplify right side
   423,058.89x = 90,479,005,312.69
5. Step 5: Solve for x
   x = 90,479,005,312.69/423,058.89
6. Step 6: Final answer
   x = 213,868.58