Finding the Fourth Proportional to 78,107.50, 117,196.95 and 42,515.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,107.50 : 117,196.95 = 42,515.50 : x
2. Step 2: Convert to fraction form
   78,107.50/117,196.95 = 42,515.50/x
3. Step 3: Cross multiply
   78,107.50x = 117,196.95 × 42,515.50
4. Step 4: Simplify right side
   78,107.50x = 4,982,686,927.73
5. Step 5: Solve for x
   x = 4,982,686,927.73/78,107.50
6. Step 6: Final answer
   x = 63,792.68