Finding the Fourth Proportional to 78,972.29, 118,513.78 and 45,646.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,972.29 : 118,513.78 = 45,646.50 : x
2. Step 2: Convert to fraction form
   78,972.29/118,513.78 = 45,646.50/x
3. Step 3: Cross multiply
   78,972.29x = 118,513.78 × 45,646.50
4. Step 4: Simplify right side
   78,972.29x = 5,409,739,144.65
5. Step 5: Solve for x
   x = 5,409,739,144.65/78,972.29
6. Step 6: Final answer
   x = 68,501.74