Finding the Fourth Proportional to 42,725.30, 64,088.10 and 13,142.93

Step by Step Solution

1. Step 1: Write the proportion equation
   42,725.30 : 64,088.10 = 13,142.93 : x
2. Step 2: Convert to fraction form
   42,725.30/64,088.10 = 13,142.93/x
3. Step 3: Cross multiply
   42,725.30x = 64,088.10 × 13,142.93
4. Step 4: Simplify right side
   42,725.30x = 842,305,091.69
5. Step 5: Solve for x
   x = 842,305,091.69/42,725.30
6. Step 6: Final answer
   x = 19,714.44