Finding the Fourth Proportional to 76,403.50, 105,438.45 and 42,869.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,403.50 : 105,438.45 = 42,869.50 : x
2. Step 2: Convert to fraction form
   76,403.50/105,438.45 = 42,869.50/x
3. Step 3: Cross multiply
   76,403.50x = 105,438.45 × 42,869.50
4. Step 4: Simplify right side
   76,403.50x = 4,520,093,632.28
5. Step 5: Solve for x
   x = 4,520,093,632.28/76,403.50
6. Step 6: Final answer
   x = 59,160.82