Finding the Fourth Proportional to 53,724.72, 80,603.18 and 21,687.30

Step by Step Solution

1. Step 1: Write the proportion equation
   53,724.72 : 80,603.18 = 21,687.30 : x
2. Step 2: Convert to fraction form
   53,724.72/80,603.18 = 21,687.30/x
3. Step 3: Cross multiply
   53,724.72x = 80,603.18 × 21,687.30
4. Step 4: Simplify right side
   53,724.72x = 1,748,065,345.61
5. Step 5: Solve for x
   x = 1,748,065,345.61/53,724.72
6. Step 6: Final answer
   x = 32,537.45