Finding the Fourth Proportional to 76,424.50, 105,475.53 and 42,890.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,424.50 : 105,475.53 = 42,890.50 : x
2. Step 2: Convert to fraction form
   76,424.50/105,475.53 = 42,890.50/x
3. Step 3: Cross multiply
   76,424.50x = 105,475.53 × 42,890.50
4. Step 4: Simplify right side
   76,424.50x = 4,523,898,219.47
5. Step 5: Solve for x
   x = 4,523,898,219.47/76,424.50
6. Step 6: Final answer
   x = 59,194.35