Finding the Fourth Proportional to 423,085.32, 634,629.96 and 142,605

Step by Step Solution

1. Step 1: Write the proportion equation
   423,085.32 : 634,629.96 = 142,605 : x
2. Step 2: Convert to fraction form
   423,085.32/634,629.96 = 142,605/x
3. Step 3: Cross multiply
   423,085.32x = 634,629.96 × 142,605
4. Step 4: Simplify right side
   423,085.32x = 90,501,405,445.80
5. Step 5: Solve for x
   x = 90,501,405,445.80/423,085.32
6. Step 6: Final answer
   x = 213,908.17