Finding the Fourth Proportional to 76,315.50, 105,315.39 and 42,781.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,315.50 : 105,315.39 = 42,781.50 : x
2. Step 2: Convert to fraction form
   76,315.50/105,315.39 = 42,781.50/x
3. Step 3: Cross multiply
   76,315.50x = 105,315.39 × 42,781.50
4. Step 4: Simplify right side
   76,315.50x = 4,505,550,357.29
5. Step 5: Solve for x
   x = 4,505,550,357.29/76,315.50
6. Step 6: Final answer
   x = 59,038.47