Finding the Fourth Proportional to 76,402.09, 105,436.61 and 42,868.09

Step by Step Solution

1. Step 1: Write the proportion equation
   76,402.09 : 105,436.61 = 42,868.09 : x
2. Step 2: Convert to fraction form
   76,402.09/105,436.61 = 42,868.09/x
3. Step 3: Cross multiply
   76,402.09x = 105,436.61 × 42,868.09
4. Step 4: Simplify right side
   76,402.09x = 4,519,866,086.77
5. Step 5: Solve for x
   x = 4,519,866,086.77/76,402.09
6. Step 6: Final answer
   x = 59,158.93