Finding the Fourth Proportional to 76,309.29, 105,307.76 and 42,318.25

Step by Step Solution

1. Step 1: Write the proportion equation
   76,309.29 : 105,307.76 = 42,318.25 : x
2. Step 2: Convert to fraction form
   76,309.29/105,307.76 = 42,318.25/x
3. Step 3: Cross multiply
   76,309.29x = 105,307.76 × 42,318.25
4. Step 4: Simplify right side
   76,309.29x = 4,456,439,957.15
5. Step 5: Solve for x
   x = 4,456,439,957.15/76,309.29
6. Step 6: Final answer
   x = 58,399.70