Finding the Fourth Proportional to 72,684.66, 109,077.34 and 28,311.78

Step by Step Solution

1. Step 1: Write the proportion equation
   72,684.66 : 109,077.34 = 28,311.78 : x
2. Step 2: Convert to fraction form
   72,684.66/109,077.34 = 28,311.78/x
3. Step 3: Cross multiply
   72,684.66x = 109,077.34 × 28,311.78
4. Step 4: Simplify right side
   72,684.66x = 3,088,173,653.07
5. Step 5: Solve for x
   x = 3,088,173,653.07/72,684.66
6. Step 6: Final answer
   x = 42,487.28