Finding the Fourth Proportional to 53,981.72, 80,979.34 and 28,987.40

Step by Step Solution

1. Step 1: Write the proportion equation
   53,981.72 : 80,979.34 = 28,987.40 : x
2. Step 2: Convert to fraction form
   53,981.72/80,979.34 = 28,987.40/x
3. Step 3: Cross multiply
   53,981.72x = 80,979.34 × 28,987.40
4. Step 4: Simplify right side
   53,981.72x = 2,347,380,520.32
5. Step 5: Solve for x
   x = 2,347,380,520.32/53,981.72
6. Step 6: Final answer
   x = 43,484.73