Finding the Fourth Proportional to 76,779.47, 105,958.94 and 42,788.00

Step by Step Solution

1. Step 1: Write the proportion equation
   76,779.47 : 105,958.94 = 42,788.00 : x
2. Step 2: Convert to fraction form
   76,779.47/105,958.94 = 42,788.00/x
3. Step 3: Cross multiply
   76,779.47x = 105,958.94 × 42,788.00
4. Step 4: Simplify right side
   76,779.47x = 4,533,770,380.99
5. Step 5: Solve for x
   x = 4,533,770,380.99/76,779.47
6. Step 6: Final answer
   x = 59,049.26