Finding the Fourth Proportional to 136,436.72, 204,645.09 and 42,969.20

Step by Step Solution

1. Step 1: Write the proportion equation
   136,436.72 : 204,645.09 = 42,969.20 : x
2. Step 2: Convert to fraction form
   136,436.72/204,645.09 = 42,969.20/x
3. Step 3: Cross multiply
   136,436.72x = 204,645.09 × 42,969.20
4. Step 4: Simplify right side
   136,436.72x = 8,793,435,801.23
5. Step 5: Solve for x
   x = 8,793,435,801.23/136,436.72
6. Step 6: Final answer
   x = 64,450.65