Finding the Fourth Proportional to 72,691.34, 109,015.94 and 28,308.20

Step by Step Solution

1. Step 1: Write the proportion equation
   72,691.34 : 109,015.94 = 28,308.20 : x
2. Step 2: Convert to fraction form
   72,691.34/109,015.94 = 28,308.20/x
3. Step 3: Cross multiply
   72,691.34x = 109,015.94 × 28,308.20
4. Step 4: Simplify right side
   72,691.34x = 3,086,045,032.71
5. Step 5: Solve for x
   x = 3,086,045,032.71/72,691.34
6. Step 6: Final answer
   x = 42,454.09