Finding the Fourth Proportional to 42,725.65, 64,082.95 and 13,142.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,725.65 : 64,082.95 = 13,142.83 : x
2. Step 2: Convert to fraction form
   42,725.65/64,082.95 = 13,142.83/x
3. Step 3: Cross multiply
   42,725.65x = 64,082.95 × 13,142.83
4. Step 4: Simplify right side
   42,725.65x = 842,231,317.75
5. Step 5: Solve for x
   x = 842,231,317.75/42,725.65
6. Step 6: Final answer
   x = 19,712.55