Finding the Fourth Proportional to 76,309.89, 105,307.12 and 42,318.35

Step by Step Solution

1. Step 1: Write the proportion equation
   76,309.89 : 105,307.12 = 42,318.35 : x
2. Step 2: Convert to fraction form
   76,309.89/105,307.12 = 42,318.35/x
3. Step 3: Cross multiply
   76,309.89x = 105,307.12 × 42,318.35
4. Step 4: Simplify right side
   76,309.89x = 4,456,423,035.12
5. Step 5: Solve for x
   x = 4,456,423,035.12/76,309.89
6. Step 6: Final answer
   x = 58,399.02