Finding the Fourth Proportional to 78,981.57, 117,861.12 and 70,570.17

Step by Step Solution

1. Step 1: Write the proportion equation
   78,981.57 : 117,861.12 = 70,570.17 : x
2. Step 2: Convert to fraction form
   78,981.57/117,861.12 = 70,570.17/x
3. Step 3: Cross multiply
   78,981.57x = 117,861.12 × 70,570.17
4. Step 4: Simplify right side
   78,981.57x = 8,317,479,274.79
5. Step 5: Solve for x
   x = 8,317,479,274.79/78,981.57
6. Step 6: Final answer
   x = 105,309.12