Finding the Fourth Proportional to 76,422.50, 105,472.78 and 42,888.50

Step by Step Solution

1. Step 1: Write the proportion equation
   76,422.50 : 105,472.78 = 42,888.50 : x
2. Step 2: Convert to fraction form
   76,422.50/105,472.78 = 42,888.50/x
3. Step 3: Cross multiply
   76,422.50x = 105,472.78 × 42,888.50
4. Step 4: Simplify right side
   76,422.50x = 4,523,569,325.03
5. Step 5: Solve for x
   x = 4,523,569,325.03/76,422.50
6. Step 6: Final answer
   x = 59,191.59