Finding the Fourth Proportional to 53,145.30, 73,345.69 and 39,693.20

Step by Step Solution

1. Step 1: Write the proportion equation
   53,145.30 : 73,345.69 = 39,693.20 : x
2. Step 2: Convert to fraction form
   53,145.30/73,345.69 = 39,693.20/x
3. Step 3: Cross multiply
   53,145.30x = 73,345.69 × 39,693.20
4. Step 4: Simplify right side
   53,145.30x = 2,911,325,142.31
5. Step 5: Solve for x
   x = 2,911,325,142.31/53,145.30
6. Step 6: Final answer
   x = 54,780.48