Finding the Fourth Proportional to 76,773.50, 105,947.61 and 43,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,773.50 : 105,947.61 = 43,239.50 : x
2. Step 2: Convert to fraction form
   76,773.50/105,947.61 = 43,239.50/x
3. Step 3: Cross multiply
   76,773.50x = 105,947.61 × 43,239.50
4. Step 4: Simplify right side
   76,773.50x = 4,581,121,682.60
5. Step 5: Solve for x
   x = 4,581,121,682.60/76,773.50
6. Step 6: Final answer
   x = 59,670.61