Finding the Fourth Proportional to 70,678.71, 105,960.60 and 39,087.50

Step by Step Solution

1. Step 1: Write the proportion equation
   70,678.71 : 105,960.60 = 39,087.50 : x
2. Step 2: Convert to fraction form
   70,678.71/105,960.60 = 39,087.50/x
3. Step 3: Cross multiply
   70,678.71x = 105,960.60 × 39,087.50
4. Step 4: Simplify right side
   70,678.71x = 4,141,734,422.70
5. Step 5: Solve for x
   x = 4,141,734,422.70/70,678.71
6. Step 6: Final answer
   x = 58,599.46