Finding the Fourth Proportional to 112,389.86, 168,609.90 and 42,269.78

Step by Step Solution

1. Step 1: Write the proportion equation
   112,389.86 : 168,609.90 = 42,269.78 : x
2. Step 2: Convert to fraction form
   112,389.86/168,609.90 = 42,269.78/x
3. Step 3: Cross multiply
   112,389.86x = 168,609.90 × 42,269.78
4. Step 4: Simplify right side
   112,389.86x = 7,127,103,378.82
5. Step 5: Solve for x
   x = 7,127,103,378.82/112,389.86
6. Step 6: Final answer
   x = 63,414.11