Finding the Fourth Proportional to 76,490.72, 105,556.56 and 42,956

Step by Step Solution

1. Step 1: Write the proportion equation
   76,490.72 : 105,556.56 = 42,956 : x
2. Step 2: Convert to fraction form
   76,490.72/105,556.56 = 42,956/x
3. Step 3: Cross multiply
   76,490.72x = 105,556.56 × 42,956
4. Step 4: Simplify right side
   76,490.72x = 4,534,287,591.36
5. Step 5: Solve for x
   x = 4,534,287,591.36/76,490.72
6. Step 6: Final answer
   x = 59,278.92